S4RS Wheels to S2R1000 (New Idea)

[NAKID]

Any other ideas? I won't be able to spend any kind of time with it until this weekend at the earliest so I'd like to at least have an idea beforehand...

[silentbob]

Call Motowheels.  They will take the stock S4Rs wheels on trade and get you a set of forged wheels in their place.

[TAftonomos]

Take the oppurtunity to upgrade to forks with radial bottoms.

848/1098 will work on the cheap, and of course, ohlins will as well. 

Spend $600 making some rotors work, or $600 getting a better front end.....

[NAKID]

But I'll have to get either new triples or have them machined right? Plus, the radial bottoms won't work with the axial calipers so I'd have to get the radial calipers as well.

So far, flipping and shimming the existing rotors sounds like the easiest, most immediate solution, if it works SAFELY...

[TAftonomos]

Why would you need triples?

848 forks are 53 top/bottom.
S4Rt forks are 50/54

If the wheel fits, then the fork space/axle is fine, and so will your triples

I've seen 848 front ends go for $500 on the bay. 

BUT...since you've got axial mounted calipers.....why not just shim the caliper?

[NAKID]

Shimming the caliper would make it worse. The rotor is too far out. It either needs to move in or the caliper needs to move out. The only way to space the caliper out would be to machine material off of the inside of the fork bottom or the outside of the caliper...

[Ontario_Monster]

In the process of upgrading my S2R 800 to use an S4R frontend, calipers & forks.  Found that desmoworks will put together a set of ISR rotors 6 bolt pattern with a 15mm offset to fit the radial calipers on a standard S2R wheel, cost as about $650.00, apparently one of the 749's had the 6 bolt pattern and 15mm offset but they seem to be very hard to find.  So all this is cheaper than new wheels ..... which is what I did.

Cheers

[NAKID]

But I need 5 bolt rotors for the S4Rs wheels..

[TAftonomos]

Sorry, had it backwards in my head.  I'd rather machine a smidge off the caliper mounting surface than have rotor carriers made.  Which would have to be moved "more"....flipping them and spacing the rotors or taking 5mm off the mounting surface of the caliper?

OH....and THANKS Michael for returning an email, phone call or PM telling me you didn't need the wheels.  After you had bought the front end and we talked, it seemed like you were pretty much set on a set of wheels.  No idea how many people I told the wheels were sold to.  That will teach me in the future.  6 bolt is easier because of the 748R or corsa rotor offset....15mm w/6 bolt.  He needs a 5 bolt the other way and it doesn't exist

[NAKID]

The machining is a little more invasive. Plus, the rotor doesn't have a ton of offset to begin with, so it should need to be shimmed THAT much...

[silentbob]

Call Motowheels first and get a price.  Forged wheels are better anyway.

[NAKID]

OK, so I figured since I had the wheels and rotors here, I would try what Mark recommended. I took the rotor off and flipped it over then played with washers to shim it back out to the proper offset.

Good news and bad news

Good news is it worked. I could space them out enough for everything to line up like it should.

Bad news is it took 9.5mm (7 washers) to get it there. I had considered having a hub-centric spacer made once I found the proper thickness, but that is a whole lotta work. Also, the rotor bolts only have about 2-3 threads into the wheel with that much spacing so I would need longer rotor bolts as well. Not to mention the additional weight this would add since I would have to do it on both sides.

My only other option to keep this as inexpensive as possible is to get HMT rotors. They are the proper offset and bolt pattern, but they are also only 310mm, not 320. That would equate to 5mm less for the brake pads to grab onto. Is that significant? I don't know.

[NAKID]

Just thought of another idea. Can't I just buy the HMT rotor hats, drill out the buttons on the stock set and install the new HMT hats to my S4RS rotors with new buttons?

[silentbob]

Could work, if the blades interface with the carrier in the same way.  The buttons don't always carry all the load.  For instance the BrakeTech rotors have a register between the blade and the carrier that handles the brake torque as opposed to letting the buttons take the load.

Did you call Motowheels to see what kind of deal they would give you to trade your cast S4Rs wheels for a set of forged rims with the correct rotor pattern?  Plus you have your S2R wheels you can throw in too.

[NAKID]

I hadn't yet. I wanted to consider all options before I go that route...