hi guys in running the early type forks with the 40mm caliper spacing on my 748/853 track bike and im thinking of up grading the front brakes can i just change the bottom of the fork so i can put the bigger radial calipers on or do i have to change the forks complete?? cheers
the bottom bit will cost you around 500 quid for a pair of radial bottoms.......then you need to get them fitted and the forks set up again.... you could probably source a pair of 1098 ohlins complete instead...
These are 916 (40mm) forks with radial mounts and M4 monobloc calipers, fitted to a Monster but work very well;
You can also fit newer forks with your wheels, my 916 has 1198 Ohlins forks and I'm using a 916 (Marchesini) wheel, the only thing you need (other than the correct spacers) is 15mm offset discs.
15mm off set discs not needed, use 5mm disc spacers. They are around £20 on ebay. Saves loads on buying discs
I'd suggest changing the whole forks then the Calipers . I also have some Calipers up for sale soon. 999R 4 pot 4 pad. You need spacers for yr existing discs and a new spacer non speedo side plus axil
I changed my 748 forks to 1098 Showa as they were £250 for the set. I already had some cheap radial brake calipers (£130) and bought some offset disks cheap as well (I think these were £150). The only other part was that the axle spacing is different, so you need custom spacers, but I'm using a TransLogic dash so didn't need the speedo drive anyway. As for those replacement fork bottoms, you still need to buy the calipers so if you can get a cheap-ish pair of forks you may be better off swapping the whole lot instead. I've also seen those fork bottoms crack...
Each to their own but when I looked into it the 5mm spacers meant the disc wouldn't locate/contact around the wheel and would also have caused cause speedo drive clearance issues (disc bolts foul the drive) if I was keeping the speedo drive. I wasn't comfortable with that so got the wider offset discs, YMMV...
I went down the route of buying Moto Corse fork bottoms, these are for the Show forks, so once fitted all you will need is your radial calipers and 15mm offset discs. Just google Moto Corse and you should find there web site.
Hopefully not, but I did have PVM fork bottoms that did; Sadly PVM weren't interested... Only ever torqued to spec and only had the wheel removed a few times.
As others have said you can change either fork bottoms or forks.I would also opt for 15 mm offset disks over spacers any day. Ive got some 999R radial ohlins fork bottoms and carbon 999 fender to match but if I had the spare cash id take the Moto corse option or see what NCR has available.848 forks seem a very good change for the money.
Who's spec were they torqued to PVM or Ducati? The material specs could be different, material thickness thinner, along with one being a cast bottom and the other being billet machined.
