There are two different size clutch O rings?

On all three bikes they are 30mm clutch pistons. The O-rings measures at 3.65mm thick by 30.5mm ID. Hard to measure exactly, am I correct? If not what size is it?

Wolfgang takes 10 days to get parts to me and would like to find some local this Monday.
 
Rob is correct
confusion arises because there are British Standard size (imperial) O rings which are very close, I have tried to use them, bought a bag for 31 and 31 in extremely close imperial sizes (which I wont quote to avoid distress) but they DONT WORK FOR LONG, my two bags contain 100 each at a cost of about 4 pennies each one, you do t always win when you try to cheat.
CLEM
 
the thing with cable versus hydraulic to me is clear.
1) My opinion is that when a cable breaks it breaks, but when an O ring starts to leak, you can top up the fluid for ages before it actually stops working, I don't carry fluid, unless I know I have a leak, but actually with gaskets and O rings in stock, it is just SO EASY to swap out and fit new that this is extremely rare, witness the silly old (irresponsible) duffer who left home in London last July, knowing that he had to top up his fluid every time he added fuel, and he made it to Breganze where Oro was heavily pressured into doing the job, he had never even heard of a 35mmm slave piston and worst of all Duffer was carrying a spare O ring all the time, l Oro fitted it.

2) you will never get the smooth, steples, snatch free movement of hydraulics that you always suffer with cables.

I rest my case your honour, so make your choice and stick with it.
CLEM
 
Doesn't happen all the time, so it would be remiss of me not to take the opportunity to agree with Clem.

While I will stick with the OEM clutch cable on mine, for the foreseeable future, I'd be interested to hear of anyone who has converted their disc brakes to cable to enable them to take advantage of the many "benefits" cables provide.

There, I've said it!
 
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