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MG MGB Technical - Rear Wheel Cylinders - Difference

What is the bore on the rear wheel cylinders for a '73 B? I see that Moss lists 0.875" and 0.800". Would the 180-635 be correct for my car?

Thank you!

Zach
Zach Dorsch

I think that would depend on whether it's a GT or a roadster.
Dave O'Neill 2

The GT uses the larger bore cylinder. RAY
rjm RAY

I gather there is also a difference in the position of the locating peg. My GT axle appears to have had the back plates redrilled to accomodate roadster cylinders. Are they externally the same size as I think I have replacement roadter cylinders for it.
Steve Church

Steve

Externally they are identical.
There is a whole range of different sizes for Minis, Spridgets, Bs, etc. They are all interchangeable, other than the roll pin is in a different location to stop you from fitting the 'wrong' one.
Dave O'Neill 2

GT are 0.875", roadster 0.8", although GTs only changed to the larger bore in 68. V8s use the same as the roadster.
PaulH Solihull

This thread was discussed between 26/08/2010 and 27/08/2010

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