fitting different caliper to the fork

[Yorkee]

Yes. The hole didn't quite line up...

The caliper is from an early RSV mille (freebies) and the fork is a pair of rare spr forks from a TZR.

I don't want an adapter plate. I am rebuilding the fork and considering Titanium Nitride the fork legs. Which means the base
will come out. Is it likely going to trash can if I cut/weld the mounting? Is it possible to replace the base as a whole unit? What other options I have other than adding an adapter?

 

[Red_Liner740]

you can notice how the aluminum boses on the legs where the holes are drilled are elongated....They are already designed in such a way to allow for different bolt spacing. Depending on how much room that is, that may allow you to drill another hole IF it doesnt interfere with the original hole.

If it does, best solution is to have a welder fill up the alu holes and drill all new holes. In the end, it might be cheaper to just get diff calipers. I'm not sure you can even run adapters with that particular setup.

 

[JohnnyP636]

Brembo makes spacers for this situation, not sure if they have your exact fork application, but they make adapters to mount those calipers you have to other bikes they dont come on
http://www.yoyodyneti.com/Category.aspx?CategoryID=2954

The problem with new holes is generally those calipers not only have different bolt spacing, but also need to be moved out more from the fork leg to fit the rotors...Simply drilling 1 new hole or cutting and welding one new hole may not put the caliper in the right location to clear the rotor diameter...

Also when cutting and welding you really have to take your time to make a jig to hold the parts dead straight during welding, as your brakes have to be pretty bang on straight with the the rotor. It can be done, and I have done stuff like this in the past but its not for every do it yourselfer out there...And you better have a really good welder do the welding, as brakes are pretty important at times

Here is one I have made for the rear, but same idea billet adapter I made, welded to cast aluminum stock bracket

 

[Brian P]

I know you don't want to hear it ... but go with the adapter plate.

When there are rare / unobtainium parts involved, I am extremely reluctant to do any modifications at all. An adapter plate is easily reversible and this way there's no risk of buggering up the unobtainium parts.

I suspect you have the caliper upside down or left/right reversed in the first photo.

You'll probably find that neither of the holes are in a suitable location and it's pretty likely that the required location won't even be aligned with the two existing holes, and that's on top of probably being in the incorrect location in the depth direction (in and out of the page). With an adapter plate and spacers to get the depth right, none of that matters.

 

[TwistedKestrel]

Brembo makes spacers for this situation, not sure if they have your exact fork application, but they make adapters to mount those calipers you have to other bikes they dont come on
http://www.yoyodyneti.com/Category.aspx?CategoryID=2954

The problem with new holes is generally those calipers not only have different bolt spacing, but also need to be moved out more from the fork leg to fit the rotors...Simply drilling 1 new hole or cutting and welding one new hole may not put the caliper in the right location to clear the rotor diameter...

Also when cutting and welding you really have to take your time to make a jig to hold the parts dead straight during welding, as your brakes have to be pretty bang on straight with the the rotor. It can be done, and I have done stuff like this in the past but its not for every do it yourselfer out there...And you better have a really good welder do the welding, as brakes are pretty important at times

Here is one I have made for the rear, but same idea billet adapter I made, welded to cast aluminum stock bracket

Stunters are into some freaky stuff

 

[Yorkee]

83mm spacing is pretty awkward. guess I will stick with oem brake. Thanks everyone!