begging new mod, need input

[Dennyz]

Rims

The VMax rear rim, already being shaft drive is an easy fit. The down sides for me is that it is a 15" wheel and not a radial. Tire option for a 15" rear are limited. The tire that is on the rim I have is a 150mm (stock I think), but I have found 180s available.

The R1 rim is what I want, but being chain drive requires some major (and I mean major) modification. An FJ13 rim would be perfect, but I have not been able to find any (used). I want a radial on the rear because (I want radials) and I want to install the R1 front end I have (17" radial up front).

A 35mm extention work for both wheel solutions. The formual I keep going back to is 130mm (stock) + (2 *35mm) = 200mm. I can run the VMax wheel (with lot of room), while I work out the R1 rim. I found radial tires have a wider side wall width then bias ply. The 180x50 I have on the R1 rim actually measure 190mm wide. So, I may need 200mm of clearance to fit a 190 tire. For me, a 190 would just fine.

For now, I am focusing on the frame, swing arm and M/D. I figure there is no sense in fussing over what rear wheel, if I don't have the M/D where I need it.

[xschop]

I agree

Work on the 35mm spacer and I will work on a 35mm shaft extention. I also agree about which wheel to mess with later....chop

[pggg]

"...they all look like only 3/4" or 20mm is inserted into middle driven gear."

Yeah Chop, there's 20mm of contact/engagement between the shaft and middle driven gear, and cutting or skimming 4 or 5mm OFF the m.d.g 'collar' should give just that little extra room for a collar/adapter to fit the shaft splines better, without compromising the depth of the shaft inside the m.d.g any more than neccasary.

[xschop]

good news

talked with my other machinist about this and he said that he can lengthen it anywhere from 30-60mm. So i am definitly having him do mine at 35mm....

[xschop]

v max wheel

Hey Denny, Do you have a measurement of the stock vmax hub to rim backspacing? I like this guy here

[Dennyz]

XSChop,

It looks like they are putting the FJ1300 rim on the Vmax. If I had a Vmax, that is what I would do.

I will check on the back-spacing when I get home.

I'll trade you a 35mm spacer for a longer M/D shaft. Lets work something out?

[xschop]

Deal

And I will start hunting down a spare middle drive. I will look into the fj1300 wheel also. If you have a spare middle drive, strip it down to the two shafts and send to me. While we are on this subject, Do you think the original input/output shafts have to go back into their original donor housings, because they look like they are shimmed at the output shaft?

[xschop]

1 on ebay

just checked the bay and there is one now.I see why they are vmax guys are using this one, one of the pics facing hub-down looks like the right backspacing of the v-max which should be similar to th xs11. Do you know how wide that fj1300 rim is by chance? Also has a rotor very close to the xs11 diameter....looks kosher....chop

[pggg]

FJR's look huge, probably 6 inch rims, here's a 160 fellas, plenty wide enough, looks good, handles well in tight stuff, a lot of Kwaka rims are similar eg.. ZXR's, ZX9's, ZX6's and others, probably only good for chain drive though Den, the drive unit likely wouldn't need moving for your R1 rear, depends on the wheels' sideways C/|L to inside sprocket measurement, just a matter of swapping the front bevel for a sprocket.

[Dennyz]

I think the R1 and FJR1300 rear rims are both 17" x 5.5". The stock 180 for these rims looks fantastic on an XS.

A 160 would fit nicer. Even the 150 on my VMax rear wheel looks good. The rear section of the XS frame is only 6 7/8" (175mm) wide. To fit anything wider will require a bunch more frame work.

Going chain may not be out of the question for me, at least short term. Lengthing the M/D shaft and installing a 35mm spacer works good for chain drive setup also. It gets the primary out away from the case (larger sprocket).

[xschop]

just a thought

My machinist said he could extend this shaft "whatever length I wanted". he just happened to have a busted 4-wheeler shaft there that he was finishing up on and a jeep trans gear looking thing that he finished also. So depending on how crazy you are you could put a monster tire on the back, you would just need to extend out your pivots by ?????....chop

[xschop]

one more must

Must get ahold of a longer rear axle bolt. Does anyone have a spare xs11 to meaure and diameter also to be sure. I have one somewhere, please don't make me go out to the shed! the fjr 1300 might do the trick waiting for response on this one....

[50gary]

The R1 rear wheel is 17" X 6" and the tire is 190/50/17"
Cheers, 50gary

[Dennyz]

Yep, 50gary is correct. I checked the R1 wheel I have and it is a 17" x 6.0" with a 180 x 55 Dunlop.

[xschop]

left side pivot

So pggg says that if you cut the pivot bolt holder out you can reweld it to the otside of the housing and get an extra 20mm. If this is true, I will go the easy route and have a 15mm extra spacer welded onto that. That way I dont have to cut the frame....