A forum for owners of Yamaha TTR250 trail and enduro bikes!

I bought some Aprilia RS125 three spoke wheels, because they're cheap and I'm poor at the minute, to fit to my TTR. I guessed from experience (having fitted the later Y-spoke wheels to a WR200) that the hubs would be skinny enough to fit in the TTR forks and swingarm and I was right- phew! You will also be able to swap wheels over without having to bugger about with a front caliper adapter (if you want, the choice is yours). I'll  be using the standard TTR front disc to see how it goes and might get a larger one advertised for a WR250F if I think it needs one.

The rear goes straight in- same size disc, bearings and if you're lucky you'll also get a good 40-ish tooth 520 sprocket with the wheel as well. You will need to make some spacers up and I'll post the dimensions up in a bit. The rear wheel is 4 x 17 so you can fit a proper sized sticky 140/70 or 150/60-17 on it. I was given a pair of one-race-old Bridgestone S20s in 140/70 and 110/70 from a CB500 racer we help out, which was nice 

The front is easy too, the RS wheel uses a 20mm bearing so you'll need to whittle up some spacers to sleeve them down to 15mm. The good thing here is that once they're pushed into the bearings they'll be captive, so it makes swapping the wheels about even easier. The RS uses a common 320mm disc that sometimes comes with the wheels (the wheels I got came complete with discs and sprocket and useable bearings) which you can make work with the standard caliper using an adapter bracket but I chose to draw up an adapter to bolt to the RS wheel to hold the standard TTR disc, which means that I'll be able to swap wheels over easily if I want to. I probably won't, but the option's there if I do fancy pottering off up a green lane. The only thing I'll need is a spare chain to fit around the larger sprocket on the dirt wheel. The RS front wheel is 3 x 17.

I'll get some photos when the bits are all bolted to the bike, I've got the wheels in but I'm waiting for a new front sprocket and chain, and the front disc adapter from the laser cutter.

The spacer sizes will also work with the later (still cheap) 1999-2005 RS125 five spoke wheels and should work with the new shape (expensive) 2006-on Y-spoke wheels.