has anyone put a 21 rear on a tc bros rear end

[b1broc]

wondering if anyone had any pics

 

[OakBehringer]

Yes. Just about all of the fong bros bikes.

 

[ember]

Mine-

 

[OakBehringer]

Goddamn, 21" rear looks so sick. Want to build so bad.

 

[Irish_prick]

thats a nice look

 

[Tim of DO THE TON]

A 21" rear with a skinny tire on it is not much bigger than an 18" rear with a 'normal' rear tire on it.

Case in point, the 300-21 Avon Speedmaster I'm putting on my Voodoo Vintage bike is 27.2" in diameter. The rear is getting a 400-18 Avon Safety Mileage which is 26.7" in diameter.

Only 1/2" difference. So if an 18" rear rim and typical tire will fit, so will a 21" front with a naturally smaller tire.

 

[cros36]

A 21" rear with a skinny tire on it is not much bigger than an 18" rear with a 'normal' rear tire on it.

Case in point, the 300-21 Avon Speedmaster I'm putting on my Voodoo Vintage bike is 27.2" in diameter. The rear is getting a 400-18 Avon Safety Mileage which is 26.7" in diameter.

Only 1/2" difference. So if an 18" rear rim and typical tire will fit, so will a 21" front with a naturally smaller tire.

but then he cant say that he has a 21" rear.

ember, love your bike. pry the best looking tcbros rear end ive seen.

 

[Tim of DO THE TON]

Just pointing out that a 21" rear wheel will fit on any motorcycle designed for an 18" rear, so long as you're not running a big wide tall 21" tire on it.

 

[turn left]

just multiply the section width by the sidewall aspect ratio, divide by 25.4 to convert mm to in, multiply by 2, add rim diameter, and you have the outer tire diameter

example:
80/100-21 (a typical mx 21" tire)
2[(80*1.00)/25.4]+21≈27.56

vs.

130/80-18 (xs650 rear)
2[(130*.80)/25.4]+18≈26.19

1.37" difference in outer diameter
reduced to only .685" from axle to outer tire (radius)

like Tim said, it'll work