Re: wheel measurments... good info
Actually it's something to consider anytime you plus size wheels and tires. It's all about leverage, remember the bicycle wheel example from school days? The area closest to the hub moves slower than the area out by the rim. I'm not going to do the math but a mark on the rim has to travel a lot farther than a mark by the axle flange travels, they both only make one revolution and start and stop at the same time.
It takes more braking power to stop the taller wheel and plus sizing can put you in a position where your existing brakes are not enough. Weight can come into play as well and taller wheels can often mean more unsprung (not carried by the cars suspension) weight. In acceleration loosing 10lbs of unsprung weight is equal to 100lbs of sprung weight. It works the same for braking, 10 lbs extra in wheels and tires is like throwing 100lbs in the trunk.
For the website though, it's a disclaimer so if you put 20's on your car and have brake issues they are off the hook. 3% on a factory 26" - 31" tall tire is less than a 1" increase. Using my Colorado as an example it has 31" tall tires from the factory but another option package includes 28" tall tires and there is even a 26" or 27" tall tire option. The vehicle's brakes are fine with the 32" tall tires I installed.
Take a stock drum brake 1st gen that came with tires in the 25" - 26" tall range and put 28" tall tires all around and you will run into braking issues... Remember though you could run 20" wheels on it if the tires only had 3" sidewalls as the overall height ends up being 26"...
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