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Changing from grip shift to trigger shifters.

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Changing from grip shift to trigger shifters.

Old 04-01-08, 06:51 AM
  #1  
-Joseph
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Changing from grip shift to trigger shifters.

Hey all. I haven't done much wrenching on a bike in my life and I need some advice. I have a '97 GF Tassajara that has grip shifters and I don't like them. I have a tendency to twist the grips on accident when riding aggressive. So I thought maybe I would swap on some triggers shifters. I found this setup off a brand new Trek 7.3fx for $50 on Craigslist. Here are my questions. I believe the shifters are for either 24 or 27 speeds. My Tass is only 21. Will I also need to swap my cassette to match the shifter? Also, I have never messed with cables before, but mine are pretty weathered and need to be replaced so I figure now is as good as time as any. Is this job going to be over my head? Would a LBS charge much to do this for me? Is $50 a fair price for the whole set up, though I may not use the bar and stem? Any and all opinions are appreciated.

-Joseph
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Old 04-01-08, 08:00 AM
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Grand Bois
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If the bike has 21 speeds, you need 3X7 shifters.
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Old 04-01-08, 08:13 AM
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-Joseph
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what if I changed the freewheel to an 8 cog instead of a 7? Then i would get more gears. Or would it just be cheaper to get the 3x7 shifters? Thanks.

-Joseph
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Old 04-01-08, 08:14 AM
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First thing's first, count the number of shifts in the right hand shifter. Push the big thumb button in all the way a few times until it's in "easiest gear" and then put tension on the cable coming out of the shifter while clicking the smaller button (might be thumb or index finger depending on the shifter model. Count the clicks and add one.

If you are upgrading from a 7 speed rear to an 8 you will definitely need a new cassette. You will probably also need a new freehub body. If your bike is 7 and it is running a freewheel, you will probably need a whole new hub which depending on the quality of your wheel, you may just want to replace the whole wheel. You really should read this to figure out what you currently have:
http://www.sheldonbrown.com/free-k7.html

Then you can decide your upgrade path, good thing to read:
http://www.sheldonbrown.com/k7.html

If you are going from 7 to 9 you will need a new chain too, and possibly new derailers.

Unfortunately your old system, being 7 speeds, is getting on in age. Nothing inherently wrong with the design of it, but things have changed and parts have changed along with them ;-)
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Old 04-01-08, 08:16 AM
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So yes, it might be cheaper to get 3x7 triggers. You can probably find someone to trade with you even steven ;-)
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Old 04-01-08, 09:38 AM
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-Joseph
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It is a shimano Acera hub with an STX rear D.

-Joseph
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Old 04-01-08, 10:03 AM
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Ok. I believe it is a cassette now that I see the difference. It says Shimano Interactive Glide 2 and has a splined lockring. Looks just like this pick I took off sheldon brown's website. Wiki says the interactive guide is an extension of the hyperglide. So does this mean it is more upgradeable.

Here is whats on my bike:
Here is off Sheldon Browns website for reference.
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Old 04-01-08, 10:09 AM
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You need to learn to walk before you try to run.

For your first wrenching project, make sure that you have all matching parts. You'll greatly improve your chances of success and, if it doesn't work satisfactory, you'll know for sure that it's something you are doing wrong and not mis-matched parts.
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Old 04-01-08, 10:50 AM
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I pulled this maneuver on a mid-90s ZX7000; the job went smoothly. One caveat, the resulting clearance for finger access to the brake levers was altered and a mite funky. It required a little re-training and made winter-time (winter gloved) cycling tough. Overall I was tickled with the result.
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Old 04-01-08, 11:45 AM
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An easier fix might be to just move the controls in a little and continue using what you've got.

I didn't like the fat feel of the grip shifter so I moved it inwards and used longer regular grips. This worked well because I typically move the brake levers inwards so that my fore and index fingers are just resting on the very end of the lever for better leverage. This typically means the lever ends up quite a ways in on the bar and it left me with enough room to run the grip shift and regular grips. So my hands sit on the regular grips and I just slide them inward to grab the grip shift when needed.

The price for that setup off Craig'slist is fair but definetly not a great deal. You may want to shop around and see if you can find a set of 8 speed shifters. And then get an 8 speed cassete and just remove one of the cogs so it fits onto the 7 speed freehub. Or if it fits as is then you're golden. But chances are you will need to remove a cog.

If you are looking at doing the entire upgrade do be sure to check your spacing between the dropouts. Your bike is just old enough that it may have the old more narrow MTB spacing before the 135 mm became popular.
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Old 04-01-08, 12:10 PM
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$50 is too much for entry level parts like those. I'll bet you can find an entire bike with the shifters you need for that.
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Old 04-01-08, 04:07 PM
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Thanks ya'll. After even more research, I have decided to just buy some 3x7 trigger shifters off ebay.

-Joseph
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