How to: fit a yzf750 rear wheel..

[phuk72]

PM Honk - I am 99.9% sure one of his mates has done this

[billy budge]

Ta for the pointers chaps, very impressive solutions indeed.

Havent got that far yet dave with the swap to have sussed out with the caliper/disc line up but thanks for the heads up.

That is my only thought on the wheel options and that is i do love the look of the wider rear wheel as opposed to the trx original, all things that will come to light when i start on it.
Think i will still offer the yzf wheel up and have a ponder on it when i can see what it looks like (minus rubber), just want to get all possible options in front of me so i can have a plan A to Z!!!

[billy budge]

Spoken to honk pete and yes his pal did do this mod, but he dosent own the trx anymore!!

He infact used a spindle off a different bike that cannily shared the same internal dimensions as the trx spindle along with the length of the yzf spindle, was hoping he would remember which bike it was from but as yet im awaiting a reply from mr honk to see what the score is.

From that last reply dave im starting to turn toward going with the yzf wheel as thats hassle i could do without and time is not what i have at the moment due to work.

[Killerwhale]

Spoken to honk pete and yes his pal did do this mod, but he dosent own the trx anymore!!

He infact used a spindle off a different bike that cannily shared the same internal dimensions as the trx spindle along with the length of the yzf spindle, was hoping he would remember which bike it was from but as yet im awaiting a reply from mr honk to see what the score is.

From that last reply dave im starting to turn toward going with the yzf wheel as thats hassle i could do without and time is not what i have at the moment due to work.

Did you ever found out wich spindle it was??

[Killerwhale]

Here's the measurements etc I worked out when I did this...

1. If the wheel is straight out a YZF, you'll need to change the bearings for TRX ones as the diameter of the TRX rear spindle is less than the YZF's. Outside diameter of both bearings is the same.

2. You can use the TRX wheel spacers, but they need turning down as the YZF hub is wider. Turn the 'tophat' (right in the photo) one down to 13mm and the 'donut' (left in the photo) one down to 10mm

. The TRX sprocket carrier, cush drive rubbers and axle can all be used on the YZF wheel. The sprocket (providing you've got a standard one with the 2mm indent running round it) needs to be removed and 'flipped over' so the indent is on the inside: this moves the sprocket inwards by 2mm so the chain run is straight. If you've got an aftermarket flat sprocket like renthal, you may need to get into machining down either the wheel or the sprocket carrier. I didn't.

4. Standard YZF disc is the same so can be used, but I needed to put a 1mm washer on the caliper bolts, between the caliper and the caliper carrier to move the caliper over to stop the back brake binding. This might be because I fitted new rear brake pads at the same time.

Here it is all fitted. This setup gives a straight chain run, and plenty of clearance of the bigger 180 rear tyre on both sides of the swingarm and of the standard chain guard, although it does position the rear wheel slightly off-centre by a few mm, but that doesn't matter.
Only other thing to note is that you can't use a standard TRX hugger with this bigger tyre and wheel.

Also, the 180 rear tyre has a bigger diameter than the standard 160, so to compensate, I worked out you need to fit a 16 tooth front sprocket instead of the standard 17 tooth one, just to get the bike back to a gearing ratio close to how it is as standard.

Lots of debate as to whether this mod is worth it: is handling better, is it just 'bling', does it give better tyre choice etc etc which I don't want to get into here, but I think it looks good, and the bike's done a few track days with this set-up and it seems to work well.

Cheers,

Dave.

Wich bearings did you use?? Mate just bought a YZF rim and they are 52x12x28 and the standard is 47x14x20 so then you´d have to trim down the hub spacer 2mm right? ...and i THINK only bearings he found with a 52mm outer was 15 thick so even worse...
Can you shed any light on this??

cheers

[Kayla]

Here's the measurements etc I worked out when I did this...

1. If the wheel is straight out a YZF, you'll need to change the bearings for TRX ones as the diameter of the TRX rear spindle is less than the YZF's. Outside diameter of both bearings is the same.

2. You can use the TRX wheel spacers, but they need turning down as the YZF hub is wider. Turn the 'tophat' (right in the photo) one down to 13mm and the 'donut' (left in the photo) one down to 10mm

. The TRX sprocket carrier, cush drive rubbers and axle can all be used on the YZF wheel. The sprocket (providing you've got a standard one with the 2mm indent running round it) needs to be removed and 'flipped over' so the indent is on the inside: this moves the sprocket inwards by 2mm so the chain run is straight. If you've got an aftermarket flat sprocket like renthal, you may need to get into machining down either the wheel or the sprocket carrier. I didn't.

4. Standard YZF disc is the same so can be used, but I needed to put a 1mm washer on the caliper bolts, between the caliper and the caliper carrier to move the caliper over to stop the back brake binding. This might be because I fitted new rear brake pads at the same time.

Here it is all fitted. This setup gives a straight chain run, and plenty of clearance of the bigger 180 rear tyre on both sides of the swingarm and of the standard chain guard, although it does position the rear wheel slightly off-centre by a few mm, but that doesn't matter.
Only other thing to note is that you can't use a standard TRX hugger with this bigger tyre and wheel.

Also, the 180 rear tyre has a bigger diameter than the standard 160, so to compensate, I worked out you need to fit a 16 tooth front sprocket instead of the standard 17 tooth one, just to get the bike back to a gearing ratio close to how it is as standard.

Lots of debate as to whether this mod is worth it: is handling better, is it just 'bling', does it give better tyre choice etc etc which I don't want to get into here, but I think it looks good, and the bike's done a few track days with this set-up and it seems to work well.

Cheers,

Dave.

Wich bearings did you use?? Mate just bought a YZF rim and they are 52x12x28 and the standard is 47x14x20 so then you´d have to trim down the hub spacer 2mm right? ...and i THINK only bearings he found with a 52mm outer was 15 thick so even worse...
Can you shed any light on this??

cheers

Yes. I measured the YZF wheel I've got and the bearing outers are 52mm. I've decided to use standard YZF bearings with a custom hub spacer and have some top hat spacers machined up so they're captive when the wheel is removed

[slow codger]

Kept the YZF bearings in mine as well, and again had the spacers made up.

Dave E

[Killerwhale]

Yes. I measured the YZF wheel I've got and the bearing outers are 52mm. I've decided to use standard YZF bearings with a custom hub spacer and have some top hat spacers machined up so they're captive when the wheel is removed

So you did a hub spacer wich resides from bearing to bearing then? Did you keep the one wich keep the bearings in place?
Any measurements on the spacers and top hat you had made?

Cheers

[Kayla]

Yes. I measured the YZF wheel I've got and the bearing outers are 52mm. I've decided to use standard YZF bearings with a custom hub spacer and have some top hat spacers machined up so they're captive when the wheel is removed

So you did a hub spacer wich resides from bearing to bearing then? Did you keep the one wich keep the bearings in place?
Any measurements on the spacers and top hat you had made?

Cheers

I haven't had the bits made yet, just drawn (roughly) what I want and had a quick measure up. I'll dig my notes out and post up the measurements. No secret squirrel stuff from me

[slow codger]

No secret squirrel stuff here either, erm they were made with the bike and wheel held in place, Vernier gauge measurements, but I cant remember the sizes, I only remember that they were both top hat shaped.

Dave E

[Jock414]

yzf 003 2.JPG

Note this i for the yzf whit 52mm bearings wheel , you need to do all 4 spacers to make it work .

Ok this i what i did , new spacers for the spocketcarrier and the wheel ............great success high five !

The brakedisk didnt line upp so i added an extra spacer on that side( 2 mm) but if you follow the print u can do the 3mm 4.5-5mm instead if u want to.. its the right on in picture.

Dont know about offset and so on but it works werry well , do this at your own risk since im not a pro !

[Jock414]

Here it is fitted , the left is 180-55 on a standard rimm , and the the other is 180-55 on yzf . Look at the profile

[Killerwhale]

Here it is fitted , the left is 180-55 on a standard rimm , and the the other is 180-55 on yzf . Look at the profile

There ya go!!!