Off-set for R27 and R26 wheels

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Grant R26
Posts: 230
Joined: Mon Mar 28, 2011 10:40 pm

Off-set for R27 and R26 wheels

Post by Grant R26 »

Half way through a rebuild and about to re-lace my wheels but I can't find the specific measurement for the wheel off-set on a R26 or R27. The BMW shop manual does not state it...only advising that you use their Mantra tool to get it right.

My guess is there is very little offset but when I try to do the arithmetic using the diagram of the Mantra tool in the Barrington book, it comes out to 10mm which is way off I'm sure.

Does anybody know what the off-set is ? ...on the brake side please

Grant in Toronto

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Grant R26
Posts: 230
Joined: Mon Mar 28, 2011 10:40 pm

Re: Off-set for R27 and R26 wheels

Post by Grant R26 »

More on this topic.
I have used one of my R26 wheels and transferred measurements to the BMW Mantra wheel gauge diagram on page 107 of the Barrington manual.

I see now that it indicates that the rim has 1mm positive offset (+/- .1mm) when you lay a straightedge on the brake drum edge.
So very little offset.

I think I have a way forward now. But if anybody out there has anything to add or any advice, it would be very welcome

Grant in Toronto

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