X1 Carbon Fiber Extreme XB wheel and Suspension conversion

I haven’t posted in a while but I am still around and wanted to share our lastest build of one of our (www.engineeredvelocity.com) shop test Mules. This is a limited edition X1 Carbon Fiber Extreme #250 of 250. Before the purest come out for attack, nothing will be done to this bike that can’t be reversed with a weekends worth of work. All the parts will be plastic wrapped and put away for the purest later on in the life of this bike. For now we are going to mod and enjoy this bike like Erik would have wanted us to. I’ll post a few pics and if you have any questions about anything along the way just ask. We are proving that this can be done in a weekend if you sourced all your parts and bought the conversion kit. We are going to be using our conversion kit, 1125r front forks, 1125CR trees, XB front and rear wheels, EBR front rotor, EBR front caliper, and the list goes on and on.

This is what we started with, a blank canvas.

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Too bad we won’t be using this piece of art! But we will preserve it and it’s blue weave.

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Gas cap that has been put away for safe keeping!

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Rear wheel before the XB swap.

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Using our Engineered Velocity rear conversion hat spacers we are able to transform the rear of our X1 to XB rear wheel.

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Rear wheel is done. The rear caliper bracket and anti-rattle clip have to be modified. The inboard part of the rotor channel has to be opened up and both sides of the axle area will need to be machined down. This always seems to be the most complicated hurdle for people and it’s really not all that bad. We are working on a solution for this and this step will soon be eliminated as well. But for now you have to machine the stocker.

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The rear is now done. We decided to stay with the XB gearing and will be probably trying to source a 131 or 130 tooth belt.

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Nice work so far, I am looking forward to the seeing the completed project!!! Hopefully you put the gas cap on the right way.....

Make the forum great again!

Ha!! It’s good to see some of the OG forum members are still around!

The XB conversion will be done this weekend but as you well know the Bike is never “done”, lol

Super slick windscreen! I think I mentioned I rode an M-2 with this conversion for about 3500 miles and I really, really, liked it. A huge upgrade to suspension, brakes and (IMO) looks too.

The PM wheels were cool when Boyd was alive, but time marches on:black_eyed:

Why the CR triples? Just for key location? Or are they dimensionally different than the R triples in some way?

These forks and triples were sourced though the Ronin 47 project. They were the take offs from those bikes. Although the 1125’s are demisionally different yes. But I’m not sure if it was made up in the frame or the trees. Compared to previous conversions I have done, the 1125 rake and trail seems to be perfect for these tube frames. My S1 was done with XB stuff and it sacrificed turning radius.

Sorry, the question was why use 1125CR triples instead of 1125R triples. Sounds like just what happened to be sourced. Coolio.


FYI, the XB (non Ss) and 1125 rake and trail are identical. (3.3" and 21*). The headstock angle at the frames is the same as well. I guess it's possible the fork legs on the 1125's are farther forward in relation to the steering stem? That would explain the turning radius, as long as it's not a cable/wiring issue like the all the non-tuber bikes have.

Jeff, Looking forward to doing this on my '99 S3...

Moving on to the front of the bike. We have simplified the front with a simple steering stem swap. Press the factory XB/1125CR/R stem out and press our (www.engineeredvelocity.com) stem in and this will allow you to bolt the front end on without any machine work such as counter boring a set of XB/1125 trees. The only thing we had to modify is the CR upper triple tree, key tumbler area, due to the X1 having mount blocks welded to the steering neck.

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Just as a helpful hint that has helped me over the years. Take plenty of pictures to refer back to cable and harness routing.

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Updates?