900 ss/sp wheel swap - Ducati.ms - The Ultimate Ducati Forum
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post #1 of 35 (permalink) Old Aug 21st, 2019, 9:44 am Thread Starter
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900 ss/sp wheel swap

I've got a 97 900 ss/sp that is mostly stock other than high compression pistons and fcr41s and some nice carbon fiber covers. Originally, all I wanted to do with it was swap for a solo seat and high pipes and maybe get a nicer front fender and rear hugger. I don't track the bike at all, just regular street riding.

Then this week, I picked up a 750ss track bike that I'm parting out. Among other parts it has marchesini 5 spoke wheels on it. Ive never been a big fan of the stock 3 spoke wheels, but it seemed like changing them would cost more than I wanted to spend. But now that I have the wheels sitting here, I want to use them. I haven't pulled the marchesinis off the 750 yet, but, from what i can see, it looks like its using the stock 750 axle with a spacer in place of the speedo drive and the bearing on the speedo drive side is wide enough that a speedo drive wouldnt be possible. Since I want to use my stock speedo, I cant just swap it on as is. So now Im trying to figure what my options are. I suppose ill need to know what model the wheel is from unless theyre all the same, I dont really know. Then I'm wondering if its better to get sleeves and spacers made and get the speedo drive parts and put them together or just swap the whole front end from something else. I have on the shelf a complete front end from a 97 748s and I have a 2000 748 that Im going to be parting out that I could take parts from. Ideally, the wheel will bolt right up to the 97 748 front end and i can just swap it on. The question then becomes, is it an upgrade, downgrade or lateral swap to put 748s forks on my 900ss. I don't know enough about the bikes to know whats better or worse. I really just want to get the wheels that I like better visually onto the bike. Any help or advice will be much appreciated.
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post #2 of 35 (permalink) Old Aug 21st, 2019, 10:37 am
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Quote:
Originally Posted by 02z06dave View Post
I've got a 97 900 ss/sp that is mostly stock other than high compression pistons and fcr41s and some nice carbon fiber covers. Originally, all I wanted to do with it was swap for a solo seat and high pipes and maybe get a nicer front fender and rear hugger. I don't track the bike at all, just regular street riding.

Then this week, I picked up a 750ss track bike that I'm parting out. Among other parts it has marchesini 5 spoke wheels on it. Ive never been a big fan of the stock 3 spoke wheels, but it seemed like changing them would cost more than I wanted to spend. But now that I have the wheels sitting here, I want to use them. I haven't pulled the marchesinis off the 750 yet, but, from what i can see, it looks like its using the stock 750 axle with a spacer in place of the speedo drive and the bearing on the speedo drive side is wide enough that a speedo drive wouldnt be possible. Since I want to use my stock speedo, I cant just swap it on as is. So now Im trying to figure what my options are. I suppose ill need to know what model the wheel is from unless theyre all the same, I dont really know. Then I'm wondering if its better to get sleeves and spacers made and get the speedo drive parts and put them together or just swap the whole front end from something else. I have on the shelf a complete front end from a 97 748s and I have a 2000 748 that Im going to be parting out that I could take parts from. Ideally, the wheel will bolt right up to the 97 748 front end and i can just swap it on. The question then becomes, is it an upgrade, downgrade or lateral swap to put 748s forks on my 900ss. I don't know enough about the bikes to know whats better or worse. I really just want to get the wheels that I like better visually onto the bike. Any help or advice will be much appreciated.
There are a few threads on 900SS wheel swaps here in the forum that have more details. The Marchesini 5 spoke cast wheels are originally a 25mm axle and should drop right into the 748 forks, assuming the correct 25mm bearings and bearing spacer are in it. The Superbike forks are generally considered a good upgrade to the SS forks but will require boring the SS top triple and shimming the bottom one, or replacing with a Cyclecat triple that are rare as hens teeth these days.

The 748 had a mechanical speedo on a 25mm axle, swap the guts in the senders so that 25mm sender has the guts from the SS in it. The speedometer senders are not made to be taken apart. Once you do though, you'll find that all the parts swap around pretty easily. The guts are geared to match the speedo gauge installed in the dashboard. Using the 748 sender without modifying it will tend to show you something like 2.5x your actual speed.

The rear wheel will go right on with no fuss.

1994 900 SS/CR
2017 939 Supersport S
It's Italian. If I can get it to start, it'll win.
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post #3 of 35 (permalink) Old Aug 21st, 2019, 10:50 am Thread Starter
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Good deal. I was thinking maybe it would be possible to swap the 748 triple over the 900ss maybe with different bearings or something. Ill have to do some more searching and see what has been done.
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post #4 of 35 (permalink) Old Aug 21st, 2019, 1:11 pm
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Perhaps a GPS speedo would be a more simple solution?

https://toptenreviewpro.com/best-gps-speedometers/

1991 900SS
1995 900SS SP #746
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post #5 of 35 (permalink) Old Aug 21st, 2019, 1:49 pm
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Annnnnd Down the rabbit hole we go.....

Not to discourage you from swapping things around but before you go too far ask yourself why your wheel does not work. I did see the 5 spoke front (25mm axle wheel) running a solid axle from the 750. There should be a ability to mount up a mechanical speedo drive in place of a spacer. Later wheels that did not use a speedo drive did still usually have the casting for the speedo drive (25mm). I would expect the 25mm speedo drive fit into the wheel would work just fine.

Can you show a picture of the left side of the hub?

A 25mm speedo drive should be fine with your speedo, if you get one from a 748 (120/60) it may read off more than normal buy may be more accurate than one from a monster,ST or 996,998 that runs a 120/70. Keep in mind we change 120/60 tires to 120/70 all the time so the change in read speeds are minimal.
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post #6 of 35 (permalink) Old Aug 21st, 2019, 3:54 pm Thread Starter
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Annnnnd Down the rabbit hole we go.....<img src="https://www.ducati.ms/forums/images/Ducati_ms_2015/smilies/tango_face_grin.png" border="0" alt="" title="Big Grin" class="inlineimg" />

Not to discourage you from swapping things around but before you go too far ask yourself why your wheel does not work. I did see the 5 spoke front (25mm axle wheel) running a solid axle from the 750. There should be a ability to mount up a mechanical speedo drive in place of a spacer. Later wheels that did not use a speedo drive did still usually have the casting for the speedo drive (25mm). I would expect the 25mm speedo drive fit into the wheel would work just fine.

Can you show a picture of the left side of the hub?

A 25mm speedo drive should be fine with your speedo, if you get one from a 748 (120/60) it may read off more than normal buy may be more accurate than one from a monster,ST or 996,998 that runs a 120/70. Keep in mind we change 120/60 tires to 120/70 all the time so the change in read speeds are minimal.
The bearing that was used is too wide.
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post #7 of 35 (permalink) Old Aug 21st, 2019, 4:13 pm Thread Starter
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It looks like they may have even machined the hub to fit this bearing and maybe a speedo drive isnt even possible anymore. Ill get it apart tomorrow and get a better idea.
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post #8 of 35 (permalink) Old Aug 21st, 2019, 6:48 pm
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OK I know this is going to get some flak from some people, I also understand people like to tinker with their bikes. BUT ask yourself a few questions---Is this a bike that you are going to keep long term or sell it soon? If it is a real SP they are far rarer then a basic 900ss-( I have an early 91 900SS) If this is a bike you are planning on keeping for long term remember one thing--The more original it is--the more it will be worth. Modified bikes-( I am a BMW collector) never ever bring the money that an original un-molested bike will. Small little things -( My 91 900SS -I have put an SP Carbon Ft Fender & Carbon Tech High pipes & a Solo Superlight seat on it--But I have the original parts to put back on it and can put it back to stock original in less then 1/2 an hour) In the long run the bike will be worth more absolutely bone stock--to a collector. Now if the money does not mean anything to you & you dont care about what it will be worth in the future then do what you want--But remember any modifications that are not easy to reverse and that you do not have the parts to make the reversion WILL in the long run detract from the value of the bike. Remember This comes from from a collector and is from the stand point of a collector, and these bikes are getting to the vintage where collectors are looking

1991 Ducati 900ss-Euro, 1991 Ducati 907ie. 1978 Yamaha SR500, 1979 Yamaha RD400 Daytona Special, 1973 Truimph X-75, 1975 Triumph T-160, 1976 Triumph T140, BMW's too many to list
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post #9 of 35 (permalink) Old Aug 21st, 2019, 7:45 pm Thread Starter
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Originally Posted by rennsportmotorrad View Post
OK I know this is going to get some flak from some people, I also understand people like to tinker with their bikes. BUT ask yourself a few questions---Is this a bike that you are going to keep long term or sell it soon? If it is a real SP they are far rarer then a basic 900ss-( I have an early 91 900SS) If this is a bike you are planning on keeping for long term remember one thing--The more original it is--the more it will be worth. Modified bikes-( I am a BMW collector) never ever bring the money that an original un-molested bike will. Small little things -( My 91 900SS -I have put an SP Carbon Ft Fender & Carbon Tech High pipes & a Solo Superlight seat on it--But I have the original parts to put back on it and can put it back to stock original in less then 1/2 an hour) In the long run the bike will be worth more absolutely bone stock--to a collector. Now if the money does not mean anything to you & you dont care about what it will be worth in the future then do what you want--But remember any modifications that are not easy to reverse and that you do not have the parts to make the reversion WILL in the long run detract from the value of the bike. Remember This comes from from a collector and is from the stand point of a collector, and these bikes are getting to the vintage where collectors are looking
Yeah. I couldnt care less about that. I didnt pay much for the bike. Its already not all original and even if it was they still arent worth much.
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post #10 of 35 (permalink) Old Aug 21st, 2019, 8:22 pm
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Well it all depends on prospective, I have 3 BMW R68 motorcycles--now this is the rarest of all post WW2 BMW motorcycles 1452 built world wide from 1952- mid year 1954. Now 20 years ago none had sold for over $10K, Now a rat bag will bring $40K and a really nice original or a full restoration--(back to perfect factory spec) will bring $100K or over. So it's a matter of time where they will be worth a good deal of money. Remember this the lower the production number Then the higher the value in the future---I sold a bike a few years ago--I owned a 2001 MV Agusta 750 F4 Neiman Marcus bike--there were only 10 built, I sold it when it was 14 years old--& I sold it for what it sold for new--the only reason--It was a rare bike ( low production numbers) & in near perfect original condition. The person that purchased the bike from me is a collector and paid a premium price for the chance to own one, The Ducati 900 SP will fall into this niche market only because of the low number produced each year. Keep in mind I look at vintage bikes as an investment where I can hold on to them for a while and then sell them for a good profit, my vintage motorcycles are my retirement fund, I will ride and enjoy them while I can But in the long run they are an investment & the point where they are worth the most to the largest number of serious people with the $$$$ is original & bone stock. But of course it's your bike and your money so do whatever you wish to do to it---and when you decide to sell it you will get a fraction of the value compared to an original

1991 Ducati 900ss-Euro, 1991 Ducati 907ie. 1978 Yamaha SR500, 1979 Yamaha RD400 Daytona Special, 1973 Truimph X-75, 1975 Triumph T-160, 1976 Triumph T140, BMW's too many to list
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