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Cannondale SR800 Upgrade Help.

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Cannondale SR800 Upgrade Help.

Old 05-04-11, 10:27 AM
  #1  
TheBurkeMan
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Cannondale SR800 Upgrade Help.

I recently picked up a 1986 Cannondale SR800. I love the bike but I want to do some small upgrades. Right now it had down tube shifters. I ran across a cheap pair of 105 shifter/brakes from the 5600 series. Would these work on my bike with the current derailleur? It has the Suntour Superbe Pro front and rear derailleur now. What would I need to do to convert to this type of setup if this doesn't work? Sorry for the bad cell phone picture, it's all I've got at school right now.


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Old 05-04-11, 10:58 AM
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Should be fine and click on my link and take a look at my old Cannondale SR500 I did some upgrading to it and works great.
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Old 05-04-11, 11:07 AM
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TheBurkeMan
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Good I just wanted to make sure I wasn't going to have to change the derailleur. You're Cannondale looks great I'm a broke college student so I don't think mine will ever look like that.
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Old 05-04-11, 11:14 AM
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Originally Posted by JTGraphics View Post
Should be fine and click on my link and take a look at my old Cannondale SR500 I did some upgrading to it and works great.
Really ? I don't think the existing Suntour freewheel (7 speed ?) and rear derailleur were spaced for index shifting.

Your conversion (and mine) involved more than just shifters.
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Old 05-04-11, 11:20 AM
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TheBurkeMan
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So a second opinion says no... I guess I need some more responses before I make a decision.
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Old 05-04-11, 12:32 PM
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If you found old 7-speed RX6000 shifters (or whatever they're called) ... then "maaaybe" they would work, but I still doubt it.
But sounds like you're looking at 10 speed shifters, and wanting them to work with a non-index spaced freewheel. There's probably some odd ball set-up that will work with just the right combination of mish-mash parts, using 7 of the 10 clicks in the shifters, but I don't know what it is.

For me, I bought decent new & used parts for about $350 to convert my old Cannondale
- Rear 10-speed wheel
- Rear 10-speed derailleur
- 10 speed chain
- 10 speed cassette
- 10 speed shifters
I kept the original "5-speed" crankset and it works fine.
You can spend a bit less, or a lot more .....
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Old 05-04-11, 12:37 PM
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Thanks for the help I knew it would have to do some kind of modification like you said with the using 7 of the 10 clicks in the shifting for it to work. I was looking to spend as little as possible. I guess I'll stick with the downtube shifters unless anyone else has some advice that may make it work.
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Old 05-04-11, 01:35 PM
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I had a SR500 a year older than yours, I put 105 10 speed levers on and it shifted fine with the original RD.
The RD has nothing to do with indexing all that is done with in the shifters the RD only moves the chain so I do think it will work. As long as the RD has the range of movement for 10 speed it will work you will need to adjust limit screws.
Lets put it this way you have nothing to loose try! if you find you need a RD buy one, in the end it would be better to replace it anyways with a newer one it will shift cleaner.
And by the way mine did start as a 7 speed friction down tube shifting bike just as yours.

I must add thought you do need to put a 10 speed cassette on which means a new rear wheel hope this was part of your plan if not then you have a problem.
Your original question asked if the 105 will work with the RD yes you did not say anything about this > You need a 10 speed cassette and wheel to go with it.
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Old 05-04-11, 02:05 PM
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Originally Posted by JTGraphics View Post
I had a SR500 a year older than yours, I put 105 10 speed levers on and it shifted fine with the original RD.
The RD has nothing to do with indexing all that is done with in the shifters the RD only moves the chain so I do think it will work. As long as the RD has the range of movement for 10 speed it will work you will need to adjust limit screws.
Lets put it this way you have nothing to loose try! if you find you need a RD buy one, in the end it would be better to replace it anyways with a newer one it will shift cleaner.
And by the way mine did start as a 7 speed friction down tube shifting bike just as yours.

I must add thought you do need to put a 10 speed cassette on which means a new rear wheel hope this was part of your plan if not then you have a problem.
Your original question asked if the 105 will work with the RD yes you did not say anything about this > You need a 10 speed cassette and wheel to go with it.
Depends. The shifters pull the cable 'x' millimeters per click. The cassette cogs are 'y' millimeters apart. Depending on the geometry of the derailleur, it will move 'y' or 'z' millimeters laterally up & down the cassette with each click. Different makes & models move different amounts. Some are compatible, some are not. The Jtek Shiftmate is one way to compensate for incompatible equipment by changing the amount of rear derailleur movement for each click.
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Old 05-04-11, 02:07 PM
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Okay i wasn't planning on changing the rear wheel, I was wondering if I could use all the original equipment aka RD, cassette, etc. I just wanted to change the shifters to the 105's. I guess it wont work because it would require a whole new rear wheel, and that's just not in the budget.
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Old 05-04-11, 02:22 PM
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Originally Posted by TheBurkeMan View Post
Okay i wasn't planning on changing the rear wheel, I was wondering if I could use all the original equipment aka RD, cassette, etc. I just wanted to change the shifters to the 105's. I guess it wont work because it would require a whole new rear wheel, and that's just not in the budget.
Yes ^ end of story
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Old 05-04-11, 02:29 PM
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Originally Posted by Homebrew01 View Post
Depends. The shifters pull the cable 'x' millimeters per click. The cassette cogs are 'y' millimeters apart. Depending on the geometry of the derailleur, it will move 'y' or 'z' millimeters laterally up & down the cassette with each click. Different makes & models move different amounts. Some are compatible, some are not. The Jtek Shiftmate is one way to compensate for incompatible equipment by changing the amount of rear derailleur movement for each click.
Bottom line spacing between cassette cogs needs to match levers indexing thats all 9 speed matched to 9 speed and 10 to 10, everything below 6-8 spacing is the same if I recall.
Now that said their is a RD ratio of 1:1 and 2:1 pull ratio - MB verses RB which can not be mismatched.
Ok done OP has his answer good luck OP!
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Old 05-04-11, 03:22 PM
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Thanks for the help everyone, I think my questions have been answered.
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Old 06-16-11, 12:51 PM
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Hey BurkeMan, if you end up upgrading from those down tube shifters, let me know. I've got an '85 SR900 that needs the front shifter boss replaced. If you'd like, I can take the old bosses off your hands for a fair price!

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