Hi all just about to order a repair kit for my front master cylinder, all the kits listed for the nc30 are 12.70mm OD. But my road bike one is stamped 5/8. And this one is stamped 14? Any ideas ?

14mm is std NC30 m/c size
5/8 is better used on the lager Nissin calipers, or the brembos

not sure where the 12.7 is - I have not replaced these seals on my bike, which is a surprise to me.lol

Right that's good to know will query it

Does anyone know the correct dimensions?

Maybe it's the internal diameter of the 14mm seal?

Looking at the dimensions listed here, I wonder if it's actually the diameter of piston? You'd need some clearance between the piston and the bore to allow for the seal....

http://www.stuff4bikes.co.uk/front-brak ... 2521-p.asp

Just checked the bore of the cylinder it is 14mm OD any ideas

http://www.ebay.co.uk/itm/VFR400-VFR-40 ... 5d38c84434

Here

Ok David silvers just checked the sizes, standard nc30 kit is 14mm OD x 50.5mm so don't know what they are selling on ebay