rear wheel size

Joined
Oct 30, 2003
Messages
28
Hi there! I just purchased a 72 roadster that needs to be de-chopperized. the rear frame loop was cut off about 7" from the battery box area (but that's for another time). the original drum brake set-up is laced to a 16" steel wheel and I want to return this puppy to a fairly normal look. Most of the text that I've read says 19" rims are original and the way to go. However, I've noticed a lot of bikes have 18" rims. the 18" rim appeals to me just in the fact that there seems to be a lot more tire choices out there in that size. I'm not a purist who needs to restore this bike to its original specs. I just want a relatively reliable and good handling ride. Any advice would be appreciated! P.S. I'm not an outlaw and I wasn't born in 1875 (close though). That is just a type of handgun I have in my old west collection. Hey! I live in Arizona, what do you expect.
 

Anonymous

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wheel size

You'd probably do best to install an 18" rim in WM3 size. Just resist the temptation to go nuts on the tire size. IMHO a 110/90 is as big as you need if not bigger, unless you plan to carry a lot of weight.
 
Joined
May 27, 2003
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10
Outlaw: I've got an extra rear hub (sans rim) and a whole rear wheel with stock 19" hoop in my garage. Lemme know if you want either one...

r-t
 
Joined
Oct 12, 2007
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A WM3 x 18 is a bit narrow for today's tires according to the recommended rim size by the tire manufactures. I went with a WM4 x 18 on my 72 Commando and I'm well satisfied.
 
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May 19, 2006
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I run a 110/90 18 on an MT 2.5 (often referred to as WM4) and I'm quite happy with it. No clearance problems on a Mk111 and the tyre is nicely spread on the rim.

It is the preferred rim for the 110 tyre.
 
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Oct 12, 2007
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A 120/90-18 will have about 1/4 clearance on my 72 Combat and that's with a 520 chain. I talked to one of our popular Brit bike suppliers about rear tire size. He said he was having a wider swing arm developed to accomodate a tire wider than 120/90. When I asked how he was going to move the chain outboard he didn't have an answer. I don't care how wide the swing arm is, you still need to clear the chain. I guess you could start offsetting the rim more. Seems like a lot of hassle when a 110/90 is already an oversize tire. I do know that I now have a great handling bike with the Dunlop GT 501's, 100/90-19 WM-2 front and a 120/90-18 WM-4 rear.
 
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