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I moved to 180/60/16 (Avon) two month ago. The only problem may be the wheel bearing.
I moved the chain in front (sprocket) 5mm to the left and behind (crown) 9mm to the left.
Soon the right wheel bearing brake down. I replaced it with a new one (63004 2RS), but this one quitted broke after 500km.
Just unlucky? Has anyone faced the same problem? Maybe It’s the summary of moving the crown to the left and more power (I have a kit which produces approx. 80HP)? I already made 20'000km with this kit without problems.
I'm thinking to replace the original wheel bearing (63004) with a 3004 (2 reihiges Schrägkugellager -> Is German I don't know in English) with the same dimension (20x42x16). Anyone experience with that???

And please don't tell me that offsetting the chain line is no good (I know it's not ideal). But somehow the tire problem has to be solved.
I dont share the hope that somebody is going to do some tires because of a few Pasos on the road.

Theoreticly the right bearing takes more momentum due to the extra 9mm offset of the rear sprocket. The amount can be calculated, but in my first opinion it should not make the difference between 50000km's or 500km's.. (if you know what I mean) Can you change the 9mm to for example 5mm? Don't worry that the chain rubs the tyre a little (tyre warm). My 851 rubs it with standard setting

cheers Léon

rear sprocket offset has about no impact on the rear bearing as the wheel/axle is held in position on both sides by the swingarm.
Did you use quality bearings ? (I bought a cheap no-name set for my Vespa engine some time ago and had to throw some away, although brand new as they didn`t run well.)
Are you sure the bearings weren`t damaged when mounting ?
80hp is just guessing, right ?

G.

Hello. I haven't had problems with my bearing. I displaced the crown 8 mm, and the sprocket is in the original position. I have done 3000 kms with this tire without problems of bearings or anything else. I'm sorry.

By the way, can you tell information about this 80 h.p. kit, PLEASEEEE?

How about a crushed axle spacer tube from
overtightening of the axle nut?

paso750 wrote:rear sprocket offset has about no impact on the rear bearing as the wheel/axle is held in position on both sides by the swingarm.
Did you use quality bearings ? (I bought a cheap no-name set for my Vespa engine some time ago and had to throw some away, although brand new as they didn`t run well.)
Are you sure the bearings weren`t damaged when mounting ?
80hp is just guessing, right ?

G.

Mate, think I have to disagree on this one. You're correct that the inner rings of the bearings are held in position on both sides by the swing arm. Thing is that the amount of torque to the wheel is transfered through the 'balls' between inner and outer ring of the bearing..

Thing is that the amount of torque to the wheel is transfered through the 'balls' between inner and outer ring of the bearing

of course, but what does the offset of the sprocket have to do with this ?

In theory there will be more torque on the bearings, due to the distance between the rear sprocket and the center of the wheel..

Formula momentum: M=r*F
M=momentum in newton·meter (N.m)
F=force on the object in newton (N)
r=distance in meters (m)