Alan Bowler Posted December 15, 2010 Share Posted December 15, 2010 I bought a new 15" x 6.5 10 spoke Anthracite for my S3. Wheel is stamped ET13 like the other 3 I have. Got a new tyre fitted, and went to put it on... But its different! Fouls the wing stay! I'm guessing I got a CSR wheel by mistake, but wouldn't that mean it had a different offset Isn't one ET13 15x6.5 wheel the same as any other? ☹️ Link to comment Share on other sites More sharing options...
Pendennis Posted December 15, 2010 Share Posted December 15, 2010 It should be Alan. Measure overall width of wheel divide it by two, then subtract the backspace measurement, that gives you the offset Want to rent an 18th century Farmhouse in Rural Somerset? Link to comment Share on other sites More sharing options...
The Pikey Posted December 15, 2010 Share Posted December 15, 2010 I think you will find the ET13 is cast in when the wheel is made but that don't mean it's actually machined to that. I did read that the ET number on a wheel is the max it can safely be machined to but that may be BS.. Jason Link to comment Share on other sites More sharing options...
Pendennis Posted December 15, 2010 Share Posted December 15, 2010 I specified two sets of wheels with a well known manufacturer. When they arrived none of the wheels were within 3mm of my agreed specification. This was not a big problem as I did factor an element of discrepancy, but I did ring and ask why. The excuse I got was a bit like what Jason said, the measurement is programmed in but by the time the machining of the edges has been done for weight saving etc. the offset is out. I think if folk actually measured their wheels they would be surprised. I find it strange that a CC anthryte wheel could differ from each other though Want to rent an 18th century Farmhouse in Rural Somerset? Link to comment Share on other sites More sharing options...
The Pikey Posted December 15, 2010 Share Posted December 15, 2010 The other thing to consider is a normal 6x13 anthracite is marked up ET24 and the offset measures ET24 from rim to rim. But, the inner rim is thicker than the outer one which means the tyre is not sitting at ET24.. Jason Link to comment Share on other sites More sharing options...
Alan Bowler Posted December 16, 2010 Author Share Posted December 16, 2010 This is just a different wheel on the inside. Its not a few mm out - its way out. I'm guessing its for a CSR, and CC have them machined down from ET13 cast wheels. Just wish I hadn't got a balanced tyre put on it, as getting it swapped will probably be a pain now. AB Link to comment Share on other sites More sharing options...
alan c Posted December 16, 2010 Share Posted December 16, 2010 I am having an issue with different offsets on two sets of wheels. Subject to checking with the manufacturer on how much could be machined off does anyone know who could do the machining for me? Alan Link to comment Share on other sites More sharing options...
mav Posted December 16, 2010 Share Posted December 16, 2010 The CSR front wheels (6.5*15) do indeed have a completely different offset, and they will NOT fit a std S3. Link to comment Share on other sites More sharing options...
Alan Bowler Posted December 16, 2010 Author Share Posted December 16, 2010 Thanks Mav. Just found this: linky Yep, the std CSR fronts are machined to provide an offset of et40, despite what the casting on the side of the wheel says. So that explains it. ☹️ At least I'm not going mad. Lets see how keen the supplier is to sort it out... AB Link to comment Share on other sites More sharing options...
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