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Rear Wheel Conversion Revisited

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Rear Wheel Conversion Revisited

PostAuthor: faffi » Tue Jun 05, 2018 3:27 am

Mod edit: This thread was split from viewtopic.php?f=10&t=49900 due to the OP no longer contributing to the conversation. The OP's last log in was in June of 2015

faffi wrote:Having read a ton of posts on this forum as well as comparing part numbers, it seems to me that it is plausible that you can fit the final drive from a Gen I onto a Gen II swingarm - and vice verse. Hence you should be able to get the correct offset whether you put a Gen I wheel onto a Gen II bike, or a Gen II wheel onto a Gen I bike. This should not produce any challenges if you have a Gen I bike, but if you have a Gen II you will most likely have to modifiy the lower RHS shock mount to match what seems to be in a different position between the two models.

Provided I am correct, a change of final drive housing should also eliminate the need for removing said final drive for wheel removal when running Gen II wheel on a Gen I bike.


I was wrong. First, because the final drive housings differ due to the different suspension set-ups. Second, because the wheel is offset on the Gen II from the factory and the shape and size of the final drive bell casings are identical other than the mounts for the suspension bits.
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Re: Rear Wheel Conversion

PostAuthor: Newbie82 » Sat Dec 01, 2018 8:15 pm

I just ordered an 84 xv700ss wheel yesterday and I was wondering the same thing. So your saying you can't swap in a 2nd gen final drive to a 1st gen. That the offset does need to be in the rim itself?

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Re: Rear Wheel Conversion

PostAuthor: faffi » Sun Dec 02, 2018 2:44 pm

The offset is in the rim alone. The final drives have the same dimensions, but are not interchangeable. That is, the interior parts can be swapped, but the bell housing differ and cannot be swapped between Gen I and Gen II. Although they do bolt to the end of the swingarms, they do not fit to the suspension in any way.
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Re: Rear Wheel Conversion

PostAuthor: Newbie82 » Sun Dec 02, 2018 7:26 pm

One would think since a gen 2 mag wheel will fit even with a 150 tire that this offset wouldn't be an issue. I guess going up to a 17" rim like I've seen so many times is the issue but....... I'll find out in a couple days. Rather have this wheel than the 535.

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Re: Rear Wheel Conversion

PostAuthor: faffi » Mon Dec 03, 2018 5:51 am

You should be able to fit a 150/90 or 150/80 tyre to the rim you have, but regardless of the width of the tyre, the center will sit 20 mm to the right compared to the stock wheel. You can get an offset rim for a wire rim to bring it more toward the center, but that's not an option with cast wheels.
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Re: Rear Wheel Conversion

PostAuthor: Newbie82 » Mon Dec 03, 2018 7:20 am

When I first bought my bike I had a concern she had been laid down due to the rear tire being on the swing arm. That and some rash found on the engine. What I found was these rears are actually a little fickle when mounting. That being said and assuming I finally got it mounted correctly and straight, I couldn't imagine fitting anything larger than a 130 on it. I guess I'm just gonna have to wait and see what is up with these myself to fully understand. I'm trying to think of the big picture now instead of later. Meaning 99-02 R6 forks are 25mm shorter and I've read someone just beating an XT600 rear shock as a suitable replacement to death. So at 385mm that should be pretty close and will give me a slight downward slant to the front. I'm also going to have a yzf100r thunderace shock on standby at 380mm. So now wheels. I'd like to rock 17" at both ends or 17" rear and 18" front but I definitely would like a 150 on the rear. For a complete novice, this is all maddening. Measure, Measure, Measure but what to measure. After all that I have to account for trail. Build a bike they said. It'll be fun they said.

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Re: Rear Wheel Conversion

PostAuthor: faffi » Mon Dec 03, 2018 3:29 pm

The rear wheel from the XJ900 Diversion is 4.00x17 and fits. If you machine it to make it fit near the centerline, you will be limited to a 140 tyre, but if you can live with it shifted a bit to the right, I recon you can fit a 150/70 and avoid machining. But contact Chiefpep to be sure. Check these videos from him for inspiration.

https://www.youtube.com/watch?v=j9wJ3hsTcgs

https://www.youtube.com/watch?v=e0BTwx4AwaY

https://www.youtube.com/watch?v=Vr2MQ6peFQw&t
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Re: Rear Wheel Conversion

PostAuthor: faffi » Mon Dec 03, 2018 3:36 pm

And, of course, if you REALLY want to go to town, you may be able to fit a BT1100 engine, final drive and rear wheel and use a 170 or 180 rear tyre. One member wrote some time back that he had fitted either a BT1100 or XVS1100 engine, and everything lined up fine other than the output shaft being far further offset to the left. Of course, you will also have to make a new swingarm or find a way to attach the BT1100 arm to the Gen I frame, and also fabricate another top shock mount. In other words, you'd rather be dedicated in order to begin such a project :bg:
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Re: Rear Wheel Conversion

PostAuthor: Newbie82 » Tue Dec 04, 2018 9:29 am

Woo wooo woooo. Wire wheel fitment post not a "Why not just buy a different bike" post my friend. lol

I've seen you bring up that wheel selection multiple times on here and I've watched his videos on youtube. Even though I'm not a fan of that wheel at all you do bring up a good point. His offset and tire size could be useful on this topic. I also need to go through his build posts.

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Re: Rear Wheel Conversion

PostAuthor: faffi » Tue Dec 04, 2018 1:51 pm

A wire wheel will also allow you to go for any rim width you want, which is a good thing. Basically, a 3.50 for a 130/70 or 140/80, 4.00 for 140/70 and 4.50 for 150/70, if you want a perfect fit. If you could steal or borrow a 17 in wheel - any wheel - with the desired tyre width, you could remove the final drive and put the wheel inside the swingarm and measure where you want the center of the wheel to be. From that you can stipulate how the rim must be offset - if at all.
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Re: Rear Wheel Conversion

PostAuthor: Newbie82 » Wed Dec 05, 2018 7:27 am

Your in my head. So for information purposes and any wondering soul looking for info on this this is what I've found
Cbass build: 5mm offset 15" Rim
Chief Pep scrambler: 20mm offset 17" Rim xv1100 hub not XVS1100 hub which is disc brake.
Chief Pep Cafe: 8mm offset 17" Diversion/ Seca Rim not wire but 150 tire.
Considering we all have the "only able to fit a dollar bill" issue with our 130 tires and the swing arm, I highly doubt that going 20mm is logical while expecting to fit a 150. There is a great write up using XV535 and XV1100 rims but I can only find it via google because the search on here is lets just say lacking but its simply titled "wire spoke wheels".

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Re: Rear Wheel Conversion

PostAuthor: faffi » Wed Dec 05, 2018 4:59 pm

I do not recall the clearance between the swingarm and the 130/90-16 tyre, but I believe it was at least 1/4in. A 150/70 is, theoretically, 20 mm wider than the stock dimension. So regardless of the original clearance between rubber and swingarm, the most offset you should need is 10 mm in order to retain the original clearance.
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Re: Rear Wheel Conversion

PostAuthor: Newbie82 » Tue Dec 11, 2018 9:16 am

Agreed. Chief Pep says in his scrambler build video that he offset his rim by 2cmm. So move the decimal place once to the right and 20mm. I don't see it happening. Looking at it, the offset does look strange so I would also agreed to move it over possibly 10mm but that requires custom drilling and a set of Sun rims which are $300 a pop. With a predrilled set of rims you should be able to offset it by 5mm safely so that,s what I'm going to do. 17x4.25 rim with a 140/70 tire and go from there. I wish I believed a 150/70 fit because that opens up so many tires but the 140 looks great back there.

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Re: Rear Wheel Conversion

PostAuthor: faffi » Tue Dec 11, 2018 2:17 pm

Any chance of getting hold of a worn out tyre and see how it fits in the bike once on your new rim?
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Re: Rear Wheel Conversion

PostAuthor: Newbie82 » Thu Dec 13, 2018 10:00 am

That is actually the plan. find a 140 and 150. I'm going to wire the rims myself so I'll be able to adjust them accordingly.

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