KR-1S.co.uk Forum

So i have a set of kr1s calipers and master cylinder but only kr front wheels and forks and no discs . am i right in thinking the discs are the same and i need to make caliper mounts to suit 1s calipers .

disc diameter was 290mm on the KR-1 and 300mm on the 1S

Ah , do 1s discs fit kr wheels or am i going to have to lose my 3 spokes ?

So essentially what you're looking at doing is upgrading the front brakes to 4 pot calipers?

i thought i had some kr calipers in the many boxes of bits i have bought but it turns out i have a whole 1s set of calipers and master cylinder and only 3 kr rear calipers . i will need to buy a set of kr calipers for my back to stock bike but my track / sunny day to work bike can have whatever .i also have a 600 srad set of forks that im toying with using as they are just left over from my old track bike but i think they will prove to be far to heavy .

I've never looked at it myself, but I know the mounting points on the fork legs will be different.

I think you can do it with KR-1 wheel, discs and forks, you'll just need to modify the mounts.

Well thats not too much of a problem then i just didnt know what sort of discs to buy . ill go with 1s and see what i can cobble together . thanks for your help sir.

I seem to remember there being a clearance problem running 4 pot calipers with a KR1 front wheel. I think that the caliper would hit the spokes even when running S forks and discs from memory.
Also, I'm pretty sure that the KR1 disc is actually 280mm (perhaps 290mm was a typo?).

ILL HAVE TO GET SOME DISCS TO PLAY WITH .

As I say, I've not looked at this myself, so I would like to see what others who have experience in this area have to say.

I think you are better changing the whole front end to the S arrangement

The KR discs are unique to that model (as far as i am aware) this means
the chances of finding a decent pair after nearly 25 years is pretty
slim. Same with calipers

Trying to combine the KR and S fronts could be expensive as you
would have to fabricate mounting plates and possibly a spindle.Plus you would end up with inferior braking to the S items. I wouldn;t bother

If you want a match you can fit a S rear without any work - this also gives you a wider rim.

I would fit the SRAD forks

if damping is too stiff, put in thinner oil.
if spring is too hard, fit a softer.

Jan bros im suprised you havent suggested fitting a hub front end

ARC76 wrote:Jan bros im suprised you havent suggested fitting a hub front end

too ugly