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Old 02-22-08, 03:10 PM   #1
Pinyon
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Mid-80s Crank Replacement

I read several threads on this here, but ended up even more confused than when I started. So, here it goes:

I have a 1988 Trek road bike, with the old Shimano 105 downtube shifters, and a 6-speed rear cog setup. Somehow, I managed to shred the chainring-side crank threads with the crank puller tool, and now need to replace the cranks.

Will more modern 8-9 speed, square-tapered cranks work with that old 105 index shifting derailure group, or should I try to find a vintage part from the same era? You can find lighter Truative and Campy parts online for a decent price.

Will the 8-9 speed chainring and crank replacements made by Campy and Truative work correctly with the old shimano shifters and back hub?

Any thoughts? Thanks.
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Old 02-22-08, 04:22 PM   #2
cyccommute 
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Originally Posted by Pinyon View Post
I read several threads on this here, but ended up even more confused than when I started. So, here it goes:

I have a 1988 Trek road bike, with the old Shimano 105 downtube shifters, and a 6-speed rear cog setup. Somehow, I managed to shred the chainring-side crank threads with the crank puller tool, and now need to replace the cranks.

Will more modern 8-9 speed, square-tapered cranks work with that old 105 index shifting derailure group, or should I try to find a vintage part from the same era? You can find lighter Truative and Campy parts online for a decent price.

Will the 8-9 speed chainring and crank replacements made by Campy and Truative work correctly with the old shimano shifters and back hub?

Any thoughts? Thanks.
There shouldn't be an issue with replacing the old crank with a new one. You'll probably need a different bottom bracket since the width of the cranks have changed over time. The front shifters on your bike are probably not indexed...only the rears of that vintage were indexed. This will make life much easier since you can use just about any crank you want.

If you are looking for a new used crank, PM me. I have some I could part with.
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