My modified Katana is finally getting some loving and it needs front discs. First thing I find is I am not sure if the front end is off a 92 or 93 GSXR1100. The difference is 0.5mm for the offset (my guide taken from here https://www.isrbrakes.se/products/brakediscs/standard/)
Model Year ISR Part.No Disc diameter Central Whole Diameter' Bolt pitch diameter Bolt hole size Swept height Offset
GSXR 1100 85-92 23A-SU310-03 310 64 86 10 36 22
GSXR 1100 93- 23A-SU310-04 310 64 86 10 36 22.5
It is not that easy to determine 0.5mm trying to measure a caliper. Perhaps it doesn't matter in which case why did they change it? The forks other than this as I understand it are the same. I see people advertising discs that are suppose to support everything from about 89 - 97. I quite like these ones https://www.sbs.dk/products-1/brake-discs/5270 however they don't provide an offset (shop is checking).
I seen things where people say this 'should' be fine given the floating bits and calipers self aligning etc. Others not at the thickness of the discs also varies this can increase the offset. Then there are spacers if it needs to be further out so perhaps get the smaller offset and shim it if needed? I wondered it the "fits all" ones are in between or it is considered 0.5 makes no difference.
The calipers are six pot nissin. I'd really like to set it up with radials sometime too (really just because they suit that old style modernised look).
There are some old images of this bike here:
https://www.kiwibiker.co.nz/forums/s...light=ironpawz
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