Originally Posted by
Andrew R Stewart
Well Stuart- I agree and disagree. Agreed that wheels are made to be strong/stiff enough for normal conditions and riding, and then some. (Although I know of no manual or educational materials that suggested hitting a bump in a corner was a good idea
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Hitting bumps in corners is common…stuff happens. It’s even more common in mountain biking where the surface is not even close to as consistent as paved surfaces. Mountain bikes don’t suffer an increased incidence of the wheels being out of true on either the front or rear because of that. Mountain bikes also tend to be more likely to be involved in crashes and, again, they don’t suffer an increase in damage to the wheels
The disagree is that for the rider's body to see the force when riding over a bump (and that is how the OP's situation started) the wheels are first in line for that force and any force the body sees has to travel through the wheels. Now if the rider does fall down and the body impacts the ground things change.
That assumes that the bike and rider are a solid body. It’s more nuanced than that. The rider’s joints serve to absorb some of the shock of the impact. Simply hitting a bump…even hard enough to throw the rider off the bike…isn’t going to throw the wheels out of true. I’ve had impacts hard enough to dent the rims and seen lots of other blipped wheels that weren’t out of true. Simply falling over shouldn’t cause the wheel to buckle.
But we are closing the barn door after the horse left here. Whatever happened, and however it did, the forces were enough and directed enough to injure the wheels. So in this case the wheels were not strong enough. This is not a JRA incident.
I couldn't even begin to count the number of wheels I have trued or replaced dur to crashed and simple potholes/curbs. Nearly all the time the rider is not hurt and some of the time the rider didn't remember (or want to admit) to doing anything bad or wrong (and might try the JRA defense). Andy
The question I have is were the rims already out of true and
Ev0lutionz just noticed it after the crash? That seems more likely than a crash that happened 150 km ago.