Ducati Monster Forum

Moto Board => Tech => Topic started by: Alexaskmo on August 16, 2020, 05:35:02 AM

Title: Ducati gt1000 wheels on 1997 900ss
Post by: Alexaskmo on August 16, 2020, 05:35:02 AM
So excited!

Just bought a pair of gt1000 sport classic wired wheels. I want to install them on my 900ss 1997, anyone here done this that can advise on the mods needed?

This question is for rear wheel only as I am putting on st3 forks on the bike.

Thanks,
Alex
Title: Re: Ducati gt1000 wheels on 1997 900ss
Post by: Speeddog on August 16, 2020, 07:31:52 AM
Did you get the sport classic sprocket carrier along with it?
Title: Re: Ducati gt1000 wheels on 1997 900ss
Post by: Alexaskmo on August 16, 2020, 08:21:41 AM
Quote from: Speeddog on August 16, 2020, 07:31:52 AM
Did you get the sport classic sprocket carrier along with it?

I guess that’s my next purchase :)

Anything else? ;)
Title: Re: Ducati gt1000 wheels on 1997 900ss
Post by: ducpainter on August 16, 2020, 09:58:37 AM
The axle sizes are different both front, and rear on a stock 97 SS.

Not sure if you've already modified the front end to use a 25 mm axel.
Title: Re: Ducati gt1000 wheels on 1997 900ss
Post by: Alexaskmo on August 16, 2020, 10:06:36 AM
Quote from: ducpainter on August 16, 2020, 09:58:37 AM
The axle sizes are different both front, and rear on a stock 97 SS.

Not sure if you've already modified the front end to use a 25 mm axel.

I haven’t done anything :)

Saw a build based off a carbed 900ss where the wheels were swapped for gt1000. He used Forks from a st3 which I have bought. Other than that, nothing.
Title: Re: Ducati gt1000 wheels on 1997 900ss
Post by: ducpainter on August 16, 2020, 10:08:49 AM
Right...you said that. Sorry. :-[

The front will be no issue, but I'm pretty sure the rear axl on your SS is a smaller diameter than the bearing ID on those wheels.
Title: Re: Ducati gt1000 wheels on 1997 900ss
Post by: Alexaskmo on August 16, 2020, 10:17:09 AM
Quote from: ducpainter on August 16, 2020, 10:08:49 AM
Right...you said that. Sorry. :-[

The front will be no issue, but I'm pretty sure the rear axl on your SS is a smaller diameter than the bearing ID on those wheels.

Hope you enjoy the read :)

https://www.returnofthecaferacers.com/ducati-cafe-racer/ducati-900-supersport-scrambler/

But he’s using the rear axle? Hmmm...
Title: Re: Ducati gt1000 wheels on 1997 900ss
Post by: Duck-Stew on August 16, 2020, 08:04:42 PM
1991 to 2007 SS ran a 17mm rear axle.

GT wheels run 25mm.  No good mod goes unpunished.  Enjoy the success when you’re done.  Endure the pain of doing it.
Title: Re: Ducati gt1000 wheels on 1997 900ss
Post by: Alexaskmo on August 16, 2020, 10:07:46 PM
Quote from: Duck-Stew on August 16, 2020, 08:04:42 PM
1991 to 2007 SS ran a 17mm rear axle.

GT wheels run 25mm.  No good mod goes unpunished.  Enjoy the success when you’re done.  Endure the pain of doing it.

Haha oh nooo! ðŸ˜,
Title: Re: Ducati gt1000 wheels on 1997 900ss
Post by: Alexaskmo on August 17, 2020, 07:52:14 AM
Doesnt this look straight forward? I’m saying that as a complete beginner and unexperienced so forgive me if I’m saying something dumb :)

(https://imgur.com/gallery/h75bQOp)(https://imgur.com/gallery/ySvBShK)
Title: Re: Ducati gt1000 wheels on 1997 900ss
Post by: Duck-Stew on August 17, 2020, 07:59:27 AM
Quote from: Alexaskmo on August 17, 2020, 07:52:14 AM
Doesnt this look straight forward? I’m saying that as a complete beginner and unexperienced so forgive me if I’m saying something dumb :)

(https://imgur.com/gallery/h75bQOp)(https://imgur.com/gallery/ySvBShK)

Something wrong with the links.  I had to copy & paste to see the pics.

Yes!  It looks simple.  Modifications aren’t always as straightforward as you want.  There are several things which could or could not make this job difficult.  That’s all I was trying to say earlier.  Sorry if that message didn’t translate.

When you get the GT1000 cush drive, be sure you have BOTH spacers for the axle.  Bad things happen if not.

Do yourself a favor and find an original Ducati parts diagram for a GT1000.  Copy the picture.  It will help guide you.
Title: Re: Ducati gt1000 wheels on 1997 900ss
Post by: Alexaskmo on August 17, 2020, 09:14:39 AM
Quote from: Duck-Stew on August 17, 2020, 07:59:27 AM
Something wrong with the links.  I had to copy & paste to see the pics.

Yes!  It looks simple.  Modifications aren’t always as straightforward as you want.  There are several things which could or could not make this job difficult.  That’s all I was trying to say earlier.  Sorry if that message didn’t translate.

When you get the GT1000 cush drive, be sure you have BOTH spacers for the axle.  Bad things happen if not.

Do yourself a favor and find an original Ducati parts diagram for a GT1000.  Copy the picture.  It will help guide you.

Oh good! Intas worried i made yet another expensive mistake buying those wheels! And thanks for the tips! Much appreciated! :)
Title: Re: Ducati gt1000 wheels on 1997 900ss
Post by: ducpainter on August 17, 2020, 01:29:53 PM
Quote from: Alexaskmo on August 17, 2020, 07:52:14 AM
Doesnt this look straight forward? I’m saying that as a complete beginner and unexperienced so forgive me if I’m saying something dumb :)

(https://imgur.com/gallery/h75bQOp)(https://imgur.com/gallery/ySvBShK)
(https://i.imgur.com/khsao1r.jpeg)

(https://i.imgur.com/xu6FKsc.jpg)
Title: Re: Ducati gt1000 wheels on 1997 900ss
Post by: Duck-Stew on August 17, 2020, 02:23:28 PM
Thanks for the pictures DucPainter.

Alexaskmo:  I’m not saying you did or did not make a mistake.
Title: Re: Ducati gt1000 wheels on 1997 900ss
Post by: Alexaskmo on August 17, 2020, 09:59:27 PM
Quote from: Duck-Stew on August 17, 2020, 02:23:28 PM
Thanks for the pictures DucPainter.

Alexaskmo:  I’m not saying you did or did not make a mistake.

I’ve made more mistakes than progress in the past month so anything that isn’t clear success is a mistake at this point hehehe :)
Title: Re: Ducati gt1000 wheels on 1997 900ss
Post by: greenmonster on August 18, 2020, 03:21:46 AM
QuoteDoesnt this look straight forward?

Quoteand the axle and a few machined pieces were fabricated to allow the fitment of Sport Classic wire wheels 

Probably not so straight forward...
Title: Re: Ducati gt1000 wheels on 1997 900ss
Post by: Alexaskmo on August 18, 2020, 04:14:05 AM
Quote from: greenmonster on August 18, 2020, 03:21:46 AM
Probably not so straight forward...

Darn!! My only experience with a wheel swap is 848 wheels on a Ducati s2r1k and that was very straight forward :) I was hoping for only one higher level of difficulty :)
Title: Re: Ducati gt1000 wheels on 1997 900ss
Post by: ducpainter on August 18, 2020, 01:35:03 PM
Quote from: Alexaskmo on August 18, 2020, 04:14:05 AM
Darn!! My only experience with a wheel swap is 848 wheels on a Ducati s2r1k and that was very straight forward :) I was hoping for only one higher level of difficulty :)
Gets waaay more complicated when the axle diameters are different. Sometimes it's hard to source bearings with the smaller inner diameter that have the same thickness as the OEM bearings. That involves spacer length issues.

Like Stuart said...no good mod goes unpunished. ;D
Title: Re: Ducati gt1000 wheels on 1997 900ss
Post by: Duck-Stew on August 18, 2020, 07:34:24 PM
The ST front forks will simplify the front half of this.

I’m wondering if a 17.05mm ID / 24.95mm OD sleeve may be the fastest way forward.  Dimensions are subject to being wrong, this is just meant to convey a thought I had.
Title: Re: Ducati gt1000 wheels on 1997 900ss
Post by: Speeddog on August 18, 2020, 11:27:28 PM
If he can use the 17mm sprocket carrier with a remade tophat spacer, that will keep his existing chainline.
Aforementioned 17.05/24.95 spacer for the wheel itself
Modded/made-to-fit caliper hanger
Gamble that the rim is in the proper position laterally
Redish wheel if it's not.
Title: Re: Ducati gt1000 wheels on 1997 900ss
Post by: Duck-Stew on August 19, 2020, 02:52:25 AM
I was thinking all the way across minus a small dimension so that the lateral tension from tightening the axle would lock the OE 25mm axle  spacers.
Title: Re: Ducati gt1000 wheels on 1997 900ss
Post by: ducpainter on August 19, 2020, 03:03:24 AM
Quote from: Duck-Stew on August 19, 2020, 02:52:25 AM
I was thinking all the way across minus a small dimension so that the lateral tension from tightening the axle would lock the OE 25mm axle  spacers.
I'd go one step further and use a sleeve retaining compound on the 'bushings' to ease assembly.
Title: Re: Ducati gt1000 wheels on 1997 900ss
Post by: Duck-Stew on August 19, 2020, 03:16:08 AM
Yeah, the width is a gamble as well as chain alignment.  If it were me, I’d get the 25mm caliper hanger from the GT1000 and use it.

This is all a gamble...
Title: Re: Ducati gt1000 wheels on 1997 900ss
Post by: Speeddog on August 19, 2020, 07:14:55 AM
Quote from: Duck-Stew on August 19, 2020, 02:52:25 AM
I was thinking all the way across minus a small dimension so that the lateral tension from tightening the axle would lock the OE 25mm axle  spacers.

Yes, if he can use the SC sprocket carrier and caliper hanger.

I think he's forced to use the SC caliper hanger to provide proper positioning of the caliper, I'm 99% sure the lateral positioning is different.
Title: Re: Ducati gt1000 wheels on 1997 900ss
Post by: Duck-Stew on September 01, 2020, 08:41:43 PM
A 17mm rear axle slips snugly by hand INSIDE a stock Ducati 25mm rear axle.  Seems that could be the fastest way to adapt bearing ID in this case.

Sorry, no photo.
Title: Re: Ducati gt1000 wheels on 1997 900ss
Post by: Duck-Stew on September 01, 2020, 08:50:50 PM
Tested inside a 2003 M1000 rear axle.