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Old 11-20-2012, 06:20 AM   #16
fosterb
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Quote:
Originally Posted by Jon-Lars View Post
Stock tire width works best for a stock bike. Putting on a wider tire for the sake of appearance is pointless.

However, if you modify the engine to increase the horsepower, a wider tire works better to apply power to the road.

Wider rims can be laced on with a greater offset in order to clear the swingarm. Installation may require removing the rear drive entirely.

It works for me. I have a 130/80 on my R90S. Using an 18" front wheel helped with the turning.

we need more details on the 90 pls! and pics!!
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Old 11-20-2012, 04:58 PM   #17
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Old 11-20-2012, 06:31 PM   #18
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Hmm... what sort of clearance do you have on that 130? Didn't think it was possible.
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Old 11-20-2012, 06:48 PM   #19
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Buchanan built the wheels on this one, using shouldered Akront WM3-18 front and WM5-18 rear rims.

The rear rim was laced offset 12mm. This provides clearance from the big-tube swingarm.

Because the tires are wide, there is plenty of "patch alignment".


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Jon-Lars screwed with this post 11-20-2012 at 06:59 PM
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Old 11-21-2012, 10:11 PM   #20
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you got a build report somewhere? need some more info on that scoot, she looks beautiful!
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Old 11-22-2012, 02:03 AM   #21
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Both my airheads were greatly improved when I fitted a pair of the new Michelin pilot series tyres that are properly sized to be 3.25 and 4.00. Handling was much quicker AND more stable that the original BT45s. This is a good combination, in the wet or dry.

I found that my nominal 4.00 BT45 was in actually 118mm in width, so nearly a 120.

On your bike a 120 should fit with a bit of grunt in fitting it, if it rubs on the swinging arm there used to be a spacer that could be fitted to the hub to move the wheel away from the swinging arm.
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Old 11-23-2012, 06:09 AM   #22
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There is a spacer you can get that moves the rear wheel over about 3/16 over to the left to have the tire clear the swingarm..

Back in the racing days they ran much wider tires with a very large offset.

They even compensated with an offset for the swingarm in the frame but it could be hard on the u-joint.
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Old 11-24-2012, 07:52 AM   #23
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I doubt the small offset to the side would make any difference to the ujoint! They're made to handle offsets, up and down, so what difference would a little to the side make? They, in fact, don't do well with no movement; it's the extremes you want to avoid.
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