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Old 04-11-07, 12:29 PM   #1
cat4ever
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What would you do? (gear opinions wanted)

I bought a powertap for my road bike (dura ace - 10 speed). I would like to use it as well on my TT bike (Ultegra 9 speed).

I have two options:
1) Swap cassette/shim each time I ride the TT bike. Cheap but time consuming.
2) Upgrade TT bike to 10 speed. I have a spare 10 speed cassette so I would need 10sp bar end shifters and derailleur (and chain). More expensive but easier, just remounting the PT and running the cable.

I ride the TT bike a 1-2 times per week (not including races) and race it about a dozen times per year.

Third option of buying another PT is out of the question and 4th option of STFU is not of any help.
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Old 04-11-07, 12:36 PM   #2
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Quote:
Originally Posted by cat4ever
2) Upgrade TT bike to 10 speed. I have a spare 10 speed cassette so I would need 10sp bar end shifters and derailleur (and chain). More expensive but easier, just remounting the PT and running the cable.
incorrect all you need is a new shifter.

convert to 10 speed.

reference here.

http://www.sheldonbrown.com/dura-ace.html
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Old 04-11-07, 12:38 PM   #3
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i would upgrade to ten speed.
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Old 04-11-07, 12:41 PM   #4
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Upgrade. Just need the shifters and the chain.
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Old 04-11-07, 12:44 PM   #5
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i am not sure that you have to switch the derailleur or shifter. i think the 9 and 10 speeds rd have the same reach, and you just need to adjust the limits to get a 9speed to work with 10gears. plus, you might be able to avoid the shifter problem if you just switch it from the individual gear (sis) shifting to friction shifting. you won't click through gears anymore, but i think that you may be able to get all of the gears that way at no cost. again, this is just a guess. you'll have to try it.
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Old 04-11-07, 12:45 PM   #6
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Shifters and chain is all you need....no need for the derailleurs.
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Old 04-11-07, 12:48 PM   #7
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If you have 9 speed Shimano bar ends now, I understand that they can be set up to friction shift by flipping an internal washer. I had friction shifters on my last TT bike and really didn't feel disadvantaged compared to indexed, given that your hands are on the shifters 95% of the time.

The 9/10 cassettes are the same width, so you should be fine there (I've used old SunTour derallieurs on 10 speed cassettes with friction shifters).
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Old 04-11-07, 12:55 PM   #8
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Thanks everyone. I had no idea that I didn't have to get a rear derailluer.

I do have the DA-9sp bar end shifters that can be converted to friction.
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Old 04-11-07, 01:00 PM   #9
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Quote:
Originally Posted by cat4ever
Thanks everyone. I had no idea that I didn't have to get a rear derailluer.

I do have the DA-9sp bar end shifters that can be converted to friction.
Well there ya go!
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Old 04-11-07, 03:25 PM   #10
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Quote:
Originally Posted by Vinokurtov
If you have 9 speed Shimano bar ends now, I understand that they can be set up to friction shift by flipping an internal washer. I had friction shifters on my last TT bike and really didn't feel disadvantaged compared to indexed, given that your hands are on the shifters 95% of the time.

The 9/10 cassettes are the same width, so you should be fine there (I've used old SunTour derallieurs on 10 speed cassettes with friction shifters).
even my post wasn't saying for certain that friction shifters would work, i can't resist in saying:

I BEAT VINO...posting about 10 speed shifters

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