swapping USD fork lowers?

[xa-mont]

is it possible?

The Tuono i got has fancy radial mount brembos and well bent forks and the RSV has regular brembos and straight forks... so i want the radial mount bottoms on my straight RSV legs... unless i can get another set of 53mm forks with 100mm calliper mount spacing.

[Gitzy]

Poached from another forum Trav, but basically what I had in mind to say [:p]

there are various version of radial caliper conversions . . .
Options . . .
•Adapter plate - for either 40mm or 65mm standard caliper mounting on Showa or Ohlins forks - you get a little adapter plate that bolts on to the existing caliper mounting points - you can then add radial calipers of the 100mm variety! VERY VERY NAFF and I would question the benefit - I am sure you could probably get 108mm adapters too
•Old Ohlins R&T Forks - side mounting adapter plate setup - again you can buy an adapter plate that basically does the same as above - VERY NAFF and again I would question the benefit
•Latest Ohlins R&T forks come with a rear mounting setup - and the radial adapter looks more race bike than afterthought - its still bolted on though - LOOKS GOOD and works properly
•Showa Fork Bottoms - various options available from Italy and eBay for 100mm or 108mm calipers - look good and well made c£500 all in!
•Factory Fit Ohlins Fork Bottoms - at great expense if you have Ohlins - you can buy the complete bottom for either 100mm or 108mm calipers from Ohlins - VERY TRICK
•Aftermarket Fork Bottoms - such as JHP, PVM, MotoCorse etc - designed to fit EITHER 100mm or 108mm calipers - NOT BOTH - usually expensive - but TRICK AS FECK!!!!
Caliper Types
•100mm calipers - usually cast and usually found as standard fit on the latest sports bikes - except for those sold by Brembo direct where you can have cast or machined two-piece or MonoBloc (machined from one piece of metal) upto £600 per caliper and usually 4 pad
•108mm calipers - the only ones used by race teams (WSB, BSB & MotoGP) they are monobloc and either 2 pad (older) or the latest 4 pad variety - usually about £1200 per caliper!
Caliper Manufacturers

There are 4 main caliper manufacturers - Brembo, AP, Nissin & PVM - ONLY BREMBO make pure monobloc radials - all the others drill through the caliper to make the holes for the outside pistons - the Brembo kits is the dogs dangleys!!!!!!

The machine that they are made on costs over £1m and machines all the piston holes and oil ways in one go without damaging the external finish - all machined from the inside outwards - probably makes ZERO difference in performance from the others - but Brembo leads the way IMHO!

Setup

Offsets - usually the people who manufacture the fork bottoms for production bikes take into consideration standard wheels and disc offsets - if you buy a known make/setup - should be a straight swap - go all bespoke and you will haveto fiddle.

Swapping Bottoms

Changing the fork bottoms requires a brave man with some specialist equipment and a HUUUUUUGE vice - personally I wouldnt DIY - but I know some people have and well done to them! Its a long job for an Ohlins Technician. The compression valves found in each make of fork bottom vary wildly and can seriously affect fork setup.

Hope that this helps.

[hooligan]

I have a set of 04 gsxr 600 bent forks (radial brakes)that i think are 53mm and a set of tokiko radial calipers from a k4 gsxr 1000 if thats helpful.
What's the diameter of the RSV fork slider?

[Gitzy]

Here are some pics of a K4 GSXR Radial fork bottoms going on a 99-07 Hayabusa forks. Obviously not a straight swap but achievable Trav, and with the parts your working with (bastard [}:)]) i reckon its worth doing your homework and making it work.. there wasn't a whole heap of info where I got these from either but cross reference the fork inners your working with and do some magic..

http://p1.bikepics.com/pics/2010%5C03%5C07%5Cbikepics-1921252-full.jpg

http://p1.bikepics.com/pics/2010%5C03%5C07%5Cbikepics-1921257-800.jpg

http://p1.bikepics.com/pics/2010%5C03%5C07%5Cbikepics-1921260-800.jpg

[xa-mont]

quote:Originally posted by hooligan

I have a set of 04 gsxr 600 bent forks (radial brakes)that i think are 53mm and a set of tokiko radial calipers from a k4 gsxr 1000 if thats helpful.
What's the diameter of the RSV fork slider?


I have a set of Gix forks too on my SV (well the insurance company might have them soon) but Gix is 108 spacing and i wanna use my fancy brembos so that i can look at them and admire the great name :P

INFORMATION OVERLOAD!!!

Mayhaps i will just try and get a set of good nick 2nd gen tuono showa forks one day and then i can have my pretty brakes... i'll just have to put up with regular mount brembos til then... *sigh*

[hooligan]

That's why I mentioned the tokiko's. The "tokiko" has been ground (on purpose, not on the road) for that stealth look. I could write brembo on them in gold texta if you like.

[nick76]

Just call a decent suspension guy and ask them??

[Dynomutt]

Jap bikes are 108mm spacings except the 6 pot R1 which is 130mm, the European stuff is 100mm spacings. I've swapped fork bottoms over easily, a little heat into the caliper mounting piece and a securely mounted bar through the oil hole in the top of the stanchion and then it will come out. The thread on the bottom is the same for Kayaba and showa, I've rebuilt set of 1000K8 forks with gold 1000K2 stanchions, and also a set of 750K5 Showa forks with 1000K2 Kayaba stanchions.

[xa-mont]

now that sounds promising!

[xa-mont]

i would love to just buy the aprilia ohlins forks... but my budget doesn't allow for that.

[Dynomutt]

The Aprilia Ohlins are pretty good as you'd expect, I've used them on the FZR1066 hybrid, although these are the non radial caliper version.

[xa-mont]

the ohlins radial ones cost about 1200USD and then i need different triples as well i think cause they are different diameter. so all up would be looking close to 2k for them... not really worth it when i probably won't even be able to outride the showas