Rake and trail are measured with the bike motionless and the wheels inline and the bike straight up and down. That is the static rake and trail. . Here’s the kicker. Rake and trail change a lot while the bike is being ridden due to pitch change. Pretty obvious. But!! When you start sliding the back end and counter steering the rake and trail change drastically. . With the back tire way out to the side and the bike leaned way over and the handlebars turned way to the right you now have a rake and trail that is huge. This is why flat track bikes have such little static rake and trail. Less than you would really like for stability when hitting bumps. With a lot of static rake and trail the bike would be very cumbersome when counter steering.
That answered my question. That is... does a rear lowering link change handling / cornering on my crf450 flattracker?. Lowering rear increases trail. Raising rear decreases trail.
Very interesting. I am (kinda) looking at SM wheels for my KTM. One of my questions is that the stock is 21/18 and to go to 17/17 the geometry change is huge. Alternatively, FT wheels are 19/19 and that's still a change as back goes up. I don't see much on changing steering tube angles and am not sure if you can change rake with top/bottom triples or if the forks need to be always parallel to the tube. Great vid :)
For 5 minutes? :) Take a look at the channel page for much more content: ruclips.net/channel/UC2v6sYCEzc_dUtohg7KSvJQ I recommend the book Motorcycle Dynamics by Vittore Cossalter for the full story on chassis and suspension. Thanks for watching!
That video just explained one of the most important chassis tuning functions and one of the most misunderstood. What a person does with it, is up to them….great video!!!
Contact Durelle Racing Products: durelleracing.com/
Rake and trail are measured with the bike motionless and the wheels inline and the bike straight up and down. That is the static rake and trail.
.
Here’s the kicker. Rake and trail change a lot while the bike is being ridden due to pitch change. Pretty obvious. But!! When you start sliding the back end and counter steering the rake and trail change drastically.
.
With the back tire way out to the side and the bike leaned way over and the handlebars turned way to the right you now have a rake and trail that is huge. This is why flat track bikes have such little static rake and trail. Less than you would really like for stability when hitting bumps. With a lot of static rake and trail the bike would be very cumbersome when counter steering.
That answered my question.
That is... does a rear lowering link change handling / cornering on my crf450 flattracker?. Lowering rear increases trail. Raising rear decreases trail.
Very interesting. I am (kinda) looking at SM wheels for my KTM. One of my questions is that the stock is 21/18 and to go to 17/17 the geometry change is huge. Alternatively, FT wheels are 19/19 and that's still a change as back goes up. I don't see much on changing steering tube angles and am not sure if you can change rake with top/bottom triples or if the forks need to be always parallel to the tube. Great vid :)
Thank you for these explanations. I appreciate your videos but for me they take too long to get to the point.
That's basic rear mx shock sag setting.
well that wasnt much...
For 5 minutes? :) Take a look at the channel page for much more content: ruclips.net/channel/UC2v6sYCEzc_dUtohg7KSvJQ I recommend the book Motorcycle Dynamics by Vittore Cossalter for the full story on chassis and suspension. Thanks for watching!
That video just explained one of the most important chassis tuning functions and one of the most misunderstood. What a person does with it, is up to them….great video!!!