Rear tire alignment

Discuss all things 1970 & later Airheads right here
Post Reply
Posts: 7
Joined: Sun May 07, 2017 7:07 pm

Rear tire alignment

Post by arzueck » Sun May 21, 2017 5:31 pm

So after getting the bike off the trailer when I first got it I noticed that the rear tire was rubbing on the inside of the swing arm / drive shaft housing.

I don't know the full history of the bike but I know that since it was last ridden the tires have not been changed, and nothing else has been done to this area of the bike that should affect alignment.

I read Duane Ausherman's write up ( I've loosened the bearings and adjusted the side to side of the swing arms every which way, but even with tapping on the tire with a mallet and loosening the axle pinch bolt, I was only able to move the tire the tiniest bit. It is still rubbing on the tire, but only slightly. (Enough that it is difficult to push the bike around due to the added friction).

The swing arm bearings and wheel bearings have no play in them, so I'm ruling them out for now.

Do I have a bent frame somehow? Could the trailering have done it? Is there a specific spot on the left side of the axle where the swing arm is supposed to rest?

User avatar
Zombie Master
Posts: 8166
Joined: Sun Aug 22, 2010 12:21 am
Location: Vancouver Island BC Canada

Re: Rear tire alignment

Post by Zombie Master » Sun May 21, 2017 5:47 pm

Could it be that somebody installed a tire that was too wide?
Any and all disclaimers may apply

Kurt in S.A.
Posts: 1212
Joined: Tue Aug 03, 2010 12:08 pm

Re: Rear tire alignment

Post by Kurt in S.A. » Sun May 21, 2017 5:52 pm

Zombie Master wrote:
Sun May 21, 2017 5:47 pm
Could it be that somebody installed a tire that was too wide?
+1 What size is the tire? The R100/7 should have a 4.00x18 rear tire. If someone's installed a 120/90 tire, that would be the reason.

Kurt in S.A.

Posts: 490
Joined: Fri Oct 01, 2010 12:30 pm

Re: Rear tire alignment

Post by barryh » Mon May 22, 2017 2:42 am

If a wider tire has been fitted BMW has a wider top hat spacer available but being 10.7mm instead of 9.2 it only adds 1.5 mm of clearance. Might be enough though.

Post Reply