Another member and I were discussing different rear wheel configurations and some of the confusing information that is scattered on various threads, so....I'll try to put all of this into one thread.

Paso 750 with Original 16" rear wheel:
1) Rear axle is 20mm in diameter
2) Rear wheel bearings are SKF #63004-2RS1 with measurements of 20x42x16mm.

Paso 750 with early Ducati rim for 17mm axle:
1) Rear axle is 20mm in diameter
2) Rim's original bearings are SKF #62203-2RS1 with measurements of 17x40x16mm
3) The ideal bearing would be 20x40x16, but no such bearing exists through SKF or other manufacturer.
4) The closest available bearing is SKF #63004-2RS with measurements of 20x42x16.
5) The hub will have to be machined from 40mm OD to 42mm OD to accept the new bearing
6) A new spacer with an ID of 20mm will need to be made for the hub of the rim.

Paso 750 with 907 Swingarm and Axle Assembly and Original 16" Wheel:
1) 907 rear axle is 17mm
2) The ideal bearing for the wheels is 17x42x16, but SKF and others do not make a bearing this size.

*To use the original 16" rear wheel with the 17mm 907 rear axle (if a 907 swingarm conversion was performed):
1) it would be required to fabricate a sleeve to go over the axle to increase it's diameter to 20mm, or....
2) the chain adjusters would need to be bored out for a 20mm axle and a new axle of 20mm would have to be used. The 20mm diameter axle may have to be fabricated if an existing one will not work. The OEM Paso axle is too short in length to reuse in this application (750 axle length is 280 mm and the 907 rear axle is 350 mm with a center, non-threaded section of 305 mm), or...
3) A person may be able to make individual bushings for the inner race of each bearing (don't forgot the bearings in the sprocket carrier!!!) and necessary spacers would need to be machined for the wheel hub and any spacers between the wheel and sprocket carrier and external spacers between the wheel and swingarm....also a bushing would need to be machined and pressed into the rear brake caliper bracket.

*NOTE - With any wheel conversion, the alignment of the rear wheel with the front wheel, and also the alignment of the sprockets with a rear wheel conversion, MUST be checked.


*I believe all of the above information to be true and accurate.

I love you man, thanks for the summary
The Paso 750 rear axle is 17mm, the bearing spacer in the wheel brings id up to 20mm.
I put the bearing spacer on the 907ie rear axle and it`s no problem as both axles have the same diameter. So if one wants to use the OSCAM wheels in the 907ie swingarm, just swap the wheels. Some spacers will be necessary to correct wheel alignment. (probably noone will do this, I`m considering it as I would like to try different tire widths in future)

My remaining problem is to understand the modification described using a 17" wheel.
The axle of the 907ie is 17mm. I have 2 swingarms laying next to me. So if SS and Monster also have a 17mm rear axle there`s no need to change bearings at all unless there are two different 907ie rear axles which indeed have a diameter of 17 or 20mm.

G.

Hi
I was inspired of “ansim” and his 17” conversion "http://alltomingenting.no-ip.info/gallery/ducce" and I am thinking of going up that road with a new 17mm axel and new eccentrics. You can see my drawing at “ http://www.bikepics.com/members/klaus/90paso750/ ”. I am waiting for a offer from the machine shop. as soon as I have more data, I will return.
Klaus

fits on the 907ie axle

I was wrong, the rear P750axle is 20mm.
I solved the mistery. Seems the issue was in my parts. What I had done so far was to remove the bearings and spacers from my black/silver OSCAM front wheel and from my spare red/silver front and rear wheel. And that is the key. Get it ?
Red/silver Oscam wheels, as far as I know, were only used on some Limiteds and the 750 Sport. There are no Limiteds (that I know of) in Germany so the wheels must be from a 750S. The 750 has the same (or similar) swingarm and axle as the Supersport, hence with 17mm and a different bearing spacer.

So I finally understand and totally agree to your summary.
I didn`t pull out my black/silver rear wheel from the bike to confirm the 20mm axle, but I may do so the next days as the bearings need to be changed anyway.

G.

PS: don`t totally believe the pictures in the parts catalogue. I`ve seen an exploded view of the 750 Sport rear wheel and the picture shows a simple spacer also, not the one I removed from the wheel.