The rear discs on a U13 are 258mm in dia and 10mm thick.
The rear discs on an SR20 powered N14 pulsar are 234mm in dia and 7mm thick.
So the U13 brakes are a LOT larger.
For startes though, the U13 uses a 4 x 114.3mm stud pattern and the pulsar uses a 4 x 100mm stud pattern.
In the best case scenario, you would at a minimum need to get the U13 discs re-drilled to fit on the pulsar hub.
Does the pulsar use a floating type disc, like the U13?
Then you have the drama of fitting the caliper from the U13 to the pulsar. The handbrake system may also pose a problem with this.
In my opinion you would be much better off messing with the front brakes and leaving the rears alone. It would be much easier to convert the fronts...
Hey mate, thanks very much for info.. Drawing from the information you've given me, U13's aren't really a good option either, I'm afraid to say.. But thanks for clearing that up!
To answer your comments:
1) I was coming from an N15 SSS (SR20) Perspective though.. Our rears are 258mmx9mm - So that makes your's only 1mm wider.
2) Yes we have 100x4, so drawing on those two points - This is yet another option, that is not really worth it.. Especially with what would have to be done to make the Caliper fit. Hence.. Why I asked for the specs first, to see if it would be worth it.
3) Yes they are a floating, screw/twist type piston caliper, with integrated H/Brake..
4) We have already found a few different upgrades for the front... So now we are just trying to find an upgrade for the rears now, to even up the brake ratio, and increase overall braking power... Hence, The reason why I asked.
Currently - We only have one lead, and alas it's nothing special..
As it is, the Standard SSS Rear Brakes, with DBA Slotted rotors and EBC or RB74 Pads that are available for them - Are quite suffice, mainly we are just doing some research.
Thanks for your help though guys,
Cheers,
Rick!