Common BMX Repairs
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- Опубликовано: 17 дек 2015
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One of the many great things about bmx bikes is that they're really easy to work on. For the vast majority of repairs you'll need only allen keys and a ratchet with 15mm and 17mm sockets. If you have pegs you’ll need an extension, and it’s also good to have a pedal wrench. As is the case with any bike, I recommend investing $3 on a lifetime supply of general purpose grease.
Let's talk about a few repairs which are needed most often on BMX bikes.
Even on a new bmx you may have issues with your bars moving when you land. To fix this, first remove the bolts clamping them to your stem. Then, clean all the areas that make contact as good as you can, which will prevent any debris or loose paint from allowing the bars to move. Before you put everything back together, grease the threads on the bolts so that you can get them really tight without any issues. When reinstalling the handlebars, most riders make them about parallel with the fork, but this can be tweaked to your liking. Tighten each bolt a little at a time, so that everything sits flat and even. You’ll want to use a calibrated torque wrench to apply exactly 8 newton meters of force to each bolt. I’m kidding, it’s a BMX, so tighten the crap out of them.
Next is the headset, which consists of the bearings in the head tube. A loose headset is common in BMX because the bike is subject to hard landings and crashes. A loose headset can cause an annoying rattle and even result in damage to your frame and bearings. To test for a loose headset, you can stand in front of your bike and apply force to your bars in different directions. If you feel anything besides steering, it’s probably your headset.
To correct this, loosen the pinch bolts on the stem evenly until your bars can move independently of the fork. Then tighten the bolt on the stem cap slightly and test your headset again. Don't over-tighten this bolt, as it could make it hard to steer, or crush your bearings. You should be able to steer easily and freely. Once the headset feels right you can line up your bars and tighten the pinch bolts again.
With all the abuse that BMX cranks take it's common for them to develop a creaking sound. This usually means the spindle wasn't greased properly during installation. Unlike road and mountain bikes, BMX cranks don't usually need a crank puller for removal. On these cranks we’ll loosen the pinch bolt and remove the cap at the base of the crank. Getting the crank off the spindle may take some effort if you've been running them without grease for a while, but these ones come off pretty easily. Make sure there's a light coating of grease on the spindle and reinstall the crank arm by tightening the cap first, and then the pinch bolt. Do this for both crank arms, and the annoying creaking should be gone. Any other sounds, like popping or grinding are probably your bottom bracket, and we won’t be going over that in this video.
Like most single speed bikes, the chain tension on a BMX is set by positioning the rear wheel in the slotted dropouts. Some people have trouble getting the chain tension right, and the rear wheel lined up properly, but it's actually pretty simple. First, let's talk about chain tension.
When you turn the cranks and observe the chain on a BMX you'll notice that the drivetrain will have a "tight spot" and a loose spot. The better your parts, the less the disparity between these two extremes. We'll get back to this in a minute.
To adjust your chain tension, loosen the axle nuts and move the wheel within the dropout. When you get it to a good spot, tighten just the drive side lightly. Now turn the cranks and check the tension. If it's harder to turn the crank when you get to the tight spot, the chain may be too tight. This can stretch and weaken the chain, plus make it harder to pedal. To correct this, keep the crank on the tight spot and loosen the nut on the drive side a little. The tension on the chain should cause the wheel to move inwards slightly, and then you can retighten the nut.
Now it's time to line up your wheel. Usually the wheel will be almost perfect at this point, but if not, apply some pressure with your thumb to get the wheel into the right spot, and tighten the other nut until it stays in place. Now test your chain again and you're done. You should also grease the threads on the inner part of the rear axle so the nuts can be tightened more easily.
So those are a few of the most common repairs you should be able to perform on your BMX. Most others require the same tools and some common sense. Bmx bikes can handle all sorts of abuse, as long as you’re willing to tweak things back into place every now and then.
In the next video, we’re going to learn the first BMX techniques you’ll need to know. 
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I never knew about the tight spot on the chain, thanks.
Neither did I, I recently got a bike and it had this problem...I looked around for help and came across this video so I done as he said and now my chain is perfect....saved me money on replacing parts.
thnk god thats Normal , i thought my sprocket was broken
+Stuart Carson
i knew about the tight spot but he knows more of a advanced technique. for me the tighter it was, its good to go
cameron Callahan do I know you
It is caused by a not 100% straight shaft or sprocket. A imperfection. My Hoffman has it a little bit.
A bit of sandpaper on the stem and bars help.
The bars come with grooves so sanding them is unnecessary
@@maricelbonto3479 there is still paint in the stem and there is still some paint in the grooves...
hey Seth i'm an 11 year old about to get a BMX for Christmas. this video will defiantly help me maintain my bike. thanks
Hi the person who liked my comment thankyou
Do you still bike
You still bmx?
You still ride duuuuude 🤙🤙
damn bro ur my age now
Even though ive never ridden bmx nor i plan to, i still watch your videos seth. Just too damn good
This was great, I have been researching "where can i learn bicycle repair" for a while now, and I think this has helped. Have you ever come across - Viyackson Yenacob Review - (just google it ) ? Ive heard some incredible things about it and my cousin got great results with it.
try it
Get one don't mess wid mountain bikes tho bmx 20inch is tuff af and fun to just Cruz there is nothing to rideing a bmx i been rideing since I was 4 I'm 39 now I don't even bother owning a car anymore lol just go to Walmart start wid a cheap one ok trust me you won't regret it once you know wat U want out of a bmx go upgrade ok all it takes is 80 to 100 dollars
@@ivanvolkov4469 U FUCKING HILLEIBAILLY
@@ivanvolkov4469 damn your really fucking stupid...
My first ever BMX is on it's way in the mail and I can't wait til monday! :D
I'm 30 years old now and actually wanted to buy an Enduro/Downhill bike, but saw a sale on a GT Compe so I thought why not. Was supposed to buy a BMX last year, but didnt. I ride a bike everyday so i feel i got enough skill to get at least some tricks done on a BMX. Thanks for the videos Seth! They inspire and help a lot and you just seem like a genuinely good person :)
Nice 👍🏻 💯
I did it when I was younger but 32 and just started back. My road bike teeth to the gears popped after some intense hills ( cheap 99 dollar bike from Hudsons close to 15 years old) so now using my old bmx waiting for my newly ordered bike to come in
i'm 35 and just started riding. well, i rode when i was younger but stopped when i got my license. started back up about 4 years ago but within a few months broke my collarbone and shoulder blade. took a while to recover, but i've been back at it for a few months now. i bought a stranger complete...i'm actually watching this video because i've been having an issue with a sound/feeling in my BB/Crank area and taking it all apart. i think i just found it...but i digress.
it's dope as hell that there's other people my age just starting or restarting. idk about you guys but i feel better now than i did the past 15 years. plenty of time left to ride my dudes.
I'm 34 and got an itch for a BMX a while ago.
Found a basic Mongoose (2011 Article) for 50€ and offered 40, and the seller (young, very cheerful mom) accepted it. Visually it was in really good shape and probably not ridden much as the tires and tubes were original. Though it had bad bearings all over the place and some other problems.
-Way too tight front wheel bearings (loose ball, cup & cone) from factory were in really bad shape (some balls were half moon shaped!)
-Headset was toast (probably also too tight from factory)
-Cassette/driver had one bad small bearing and one bigger on the axle (non-drive side)
-Bad chainline, which I fixed by placing one of the shims/washers on the other side of the chainring and added a washer on the securing bolt between crank and the chainring too
-Driver pawls were toast, so I had to get creative and took some out of another mtb freewheel/cassette body
The pawls wouldn't fit in place so I had to remove material from the driver body in order to get them sitting flush when pressed down.
Driver side crank had wonky surface where the pedal should sit tight, so I had to take a file and remove material in order to properly seat the surfaces of the pedal and the crank. It's still not 100%, but more mating surface now. I was afraid they's made the threads wonky at the factory but they were straight, just the mating surface was not.
Changed the cone nuts and balls on the front hub, but it would need the cups or some novelty machining.
It's quite heavy at 12.7 Kg, but what I've gathered, weight shouldn't be an issue and should actually make ones technique better when practicing with a heavier bike.
When Seth said, "8 Newton Meters of force to each bolt", I sat there thinking for a bit about how to actually measure that XD jeez
JunnyBananza with a torque wrench duh wtf
JunnyBananza he literally said “you want to use a torque wrench”
with a torque wrench
Well you can caculate it
@@sethstevenson6523 yes but you can't get a torque wrench to that power, they only go up to 6 nm
Tighten the stem in an x pattern Seth, cmon
Yeah, this is very important
And keeping the plate flush with the stem on both sides and dont overtighten or strip the bolts by not fully inserting the allen key or applying crooked tension
R/woooooosh
@@frost3318 there was like, no joke here
@@frost3318 what are you talking about
that ending..
"Fpurhph"
I was having problems with the wheel alignment until watching this video. I followed every step and got it first time. Thanks Seth!
love your vids Seth! I've been mountain biking for a few years now. I just bought a new bmx and am looking to get back into it as well. Keep the videos coming
It can also help to lightly sand down the stem and handlebars where they clamp and if they have any burs from the bars moving previously then a file may be needed to get rid of them.
M
hi back again, I done as you showed with the chain tension problem and it worked a treat....Thanks for the video ;)
Started out watching your newer videos and enjoyed it so much I went all the way back to watch from the beginning of your channel. Its great to see how much carries over between the years and you include stuff that shows us you're human too, like the wheel hitting your chin. Not funny for you then, but you knew we'd get a chuckle. Its great!
I am pretty new to cycling and I stumbled on this channel by accident. I am extremely glad I did, the videos are great!
Thanks Seth for making these videos. I am a female and just order my first ever bmx, at 44 years old!
I am 38 and just got back into it! Good for you!
It’s never too late
04 am too Me
50 and still riding BMX.
"A calibrated whatever to apply 8nm of force..."
"Oh, crap. I thought I was done with physiques"
"I'm kidding"
"Oh, Thank you jesus!!!"
Make more bmx vids
😂
just watched this as i have chain tension issues so i'll give it a go and get let you know if it helps.
Thank you so much this video helped me fix that creaking in my cranks and please make a 180 vid please
howdy there Seth, I'm not a huge mountain biker but I race bmx for a local bike shop and ride dirt jumps on my bmx. I am using this series to teach my little sister the beginnings of bmx riding and notice a flaw with your pinch bolt tightening method, you were tightening your bolts in a square pattern but you should realy be going diagonal. (bottom left, top right, bottom right, top left) love your Chanel keep up the good work!
Great videos Seth they always look so professional
Thanks this helped a lot my bike doesnt squeak anymore!
I'm a new subscriber Seth. Love the straight forward approach to your channel.
you still here?
i hope your not a beginner now!
@@joshisaket8232 what a weird and wonderful reply mate!
Yeh I'm still here no longer a beginner but I never stop learning!
How about yourself?
@@SpMoose im kinda an amateur now...started mtb 3 years ago but me being a 15 year old i dont have the money to buy a full squish or a trail hardtail and also there arent many good trails here in pune india.what bike do you have?
very informative defo one of the best bike channnels out here
Very Helpful! Thank you
This really helped me thanks!
Thank up, you help so much I have the same bike as you in at the same exact problem with the creaking
Hello just got a new BMX bike like a few weeks ago and the pedal kept coming off and this video helped me thank you I hope you respond. 😁
This video really helped me so thank you
Thank you so much for this video. My cranks used to be soooo loud and even blasting music in my ears with headphones, I would still hear it and it would drive me crazy. Now I can't even hear my cranks
Thank youuuuuu I didn’t know if that tension was normal or not
Even tho this is a old vid it’s still good thanks for those tips
awesome vid! keep up the good work!
You saved my assss bro my bars were wiggling despite everything being tightened thank you 😭🙏🏽
Thank you for this!!🙏🏼
for a real tip, tension the bolt/nut on the hub side first, so you dont pull your tire sideways when you tighten it up.
also remove the cranks so you can get to the bearings and drown then in oil, this will stop your cranks from moving when you ride pegs.
:)
Yo it’s great too see a mtb dude that respects n rides Bmx.
I'd love to see more of your bmx side Seth.
very informative just bought a bike today a haro its 4 getting to work on time
Thanks for the info bro thanks
Best chain how to ever. Thank you
Thank you i had this creaking sound on my se bmx too and didnt now what it was
GREASE!!!! also to check the headset put the front tire up against a wall and push the bike forward to feel any looseness, you can get it perfect this way.
Helped me so much I knew what I was doing just wanted to make it better and on point I subbbedddd ❤
holy crap dude i remember watching this in 2015 not having my own bike but wanting one now i googled this and saw it again i got my own bike now its was about $300 from saving up now i watch this video cause the cranck keaps squeeking ty
You have a nice bike. I like the colors
The greasing the cranks part really helped me , I bought a used set of primo powerbite cranks and they creaked like hell. Took them off and added some grease and now they're silent.
Matthew Abt is it ok to use spray grease ?
Just cleaned my stem and bars of grease, did a couple of tricks. The bars did not moved, but we will see at the park!
Dope video
I wouldn't suggest over tightening the stem bolts, I've stripped a stem that way before. Friction paste where the stem clamps the bars works really well.
Thank you
After hours messing about trying to sort the tight spot, it's only now I find this is normal and I wasn't even looking for it 😭😅😂 Thanks for pointing that out bro.
But I think not having a tight spot is very much beneficial on the control and feel of the bike, also chain tension is kept at optimum level and wear is reduced.
The person that checks mine tightens the chain so much that I can't hold a wheelie for more than half a second so thanks Seth this help a huge amount
very usefull info
Thaxs man u help fix my bike
this helped so much😂
Have a GT and I'm starting to watch these videos so I can learn how to BMX properly.
Levi Woodall I’m getting a gt slammer for Christmas
Hey Seth, could you make another video of bmx maintence talking more about other problems I just started in bmx and can't make my back wheel stay in place keeps sliding of center then the chain become loose I also have a clicking noise on the front wheel hub, there's not really much good videos on youtube talking about bmx maintence.
Whats the trick you might have with crank spin upon the majestic un-footing of the peddles on 26" DJ bikes? Been playing loose or tight with the chain stay adjusters on the drop outs... only to get a ghost peddle now. all I got, is holding the brake... that make's the rear drop. "Learning... this new P.3 from a 20" S&M C.C.R." Use: Carving Single Track, rental bike passer in the rock garden, park. Hope you have some idea!
Seth it worked!!!
Hey seth, could you make a video on how to install gyro brakes
Thank you Seth bike hacks I am 12 years old and I have a BMX 2 and I like to do BMX a lot and I like to do big jumps and I taught all that stuff to myself because I saw a lot of your videos of you making ramps in your new house but thank you for teaching me how to do that so that's a really good thing but you do for your bikes but thank you thank you sent by text
Please make a video on bottom brackets for bmx say how to get rid of wiggling or how to tighten
Luv Redline BMX" 💪
I took a rotary tool with cylindrical diamond end and lightly removed material on the chainring to minimize the amount of tight spot. I measured each of the teeth valleys with a caliper and then proceeded to remove material where the valleys were more shallow. I noticed that even a 0,1 to 0,2 mm difference is enough to cause a tight spot.
I Love jour videos😎😎
Yo my headset was so loose that I was able to unscrew the nut above it with barely any force with my fingers I tightened it and dropped a few drops of lube on the bearings there's absolutely no play and turns smoothly thanks
I just push my tire back till the chain is fairly tense and step on my break lever n tighten them makes the wheel perfectly straight
Thx so much I needed my headset to get fixed
Someone dumped a bmx on my grandmother's land. She said it was there for a week and said she wanted to get rid of it. So at 30, I rode a BMX for the first time and took it home. I think the chain is loose as I kept coming off. I will give it some TLC tomorrow, maybe even a new paint job 😊👍 most exciting thing to happen to me all quarantine!
Ahaa fixed my loose ass crank thank you!
The end 😍
To test for loosens in the headset I hold on the front brake and go back and forth 👍
What if no front brake
If you change your cranks change your bottom bracket too because the Bottom bracket dust caps might wiggle around letting unwanted water and dirt into the bearings and frame making a squeaking noise and promoting rust buildup. Try to get the cranks and Bottom bracket from the same manufacturer to ensure they fit correctly for sure
Newton meters...lol...had me there for a second.
I have a question for whoever has an opinion. My mountain bike has a euro bottom bracket and bolt on front sprocket. I need to replace the bottom bracket but I have struggled to find out some information. Would switching to a modern bottom bracket be a smarter decision? I have a 2 piece 19mm 8spline crankshaft, would I have to replace it as well to replace the bottom bracket?
Pro tip always examine the enite drivetrian when doing repairs around the cranks/backwheel its common on entry bmx bikes to have a loose driver in the hub hell ur chain could just be a little rusted or dirty
what kind of grease do you use can you give me a link please.I am a big fan of you.
i use a long stick or broom to alighn an tighten
Please don't pull or push your back wheel across to get in inline. You'll be slightly bending the axle and then forcing it to stay like that. This will not only weaken the axle, but it will also mean your bearings don't run parallel which will ruin them. Plus as soon as you hit your back wheel it'll tend to spring back to its original position. Hope this helps.
can you please make a video about the parts of bikes since i didn't understand some the things you said
Hey nice vid
What grease is that cos I need some if it's that cheap
Hi seth, im just getting into bmx and considering to get the mongoose legion l100 or l80, wonder if you could review any or the bikes, thanks.
cool vid
I get this noise from my back wheel maybe inside like a raddling noise and have no idea how to fix it. Any suggestions or ideas that could help? thanks
hi seth! my axle for my crank set seems to keep sliding over to one side🤔 anyway of preventing this? thanks
Question I have an 83 mongoose looptail. I haven't ridden the thing in years because because the pedals started sipping Independently of the sprocket and when it happened it was so hard that you would rack yourself on the seat. What would cause this? I've been wanting to get back into BMX but without my other BMX bike is stripped all the way down and needs pretty much everything that moves replaced due to extreme abuse from the guy who gave it to me.
What is the crank start popping out when you're riding and you tight it to the normal spec
can you do a tutorial on how to replace a front axle please
I love bmx
On another video with uneven chain tension, I seen it loosen the bolt(s) on the front sprocket to adjust sprocket position, this one is not adjustable ? Rotated to the position where chain was too tight, it pushed on the chain a bit, to move the front sprocket, then tighten the bolts again.
When i start riding and make 1 crank spin it makes a crack sound but then runs smoother than a greased bullet
I love my $60 BMX from CL. I don’t bother doing anything legit so my front wheel is hand-tighten
when I put pressure on my pedal for speed something by the sprocket or chain makes a noise as if my chain slipped and I check and my chain is loose every time that noise happens (I tighten it Everytime)
MORE BMX VIDEOS PLEASE
i have this thing my bars don’t slip but they creek and it feels like they wiggling a slight mm
My head set bolt won't tighten. The bolt will just keep spinning when I turn it. It's a bolt not a Allen key kind. I have those bars that will spin with the back brakes if you understand me. I just want to figure out how to tighten the bolt so my bars won't spin if I come down to hard on a trick. Thanks
That came off to easy
lol! keep watching from 4:14
also on the 1 st use sand paper to rough the area