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Old 08-29-14, 11:00 PM   #1
MAK
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A couple of crankset questions

I'm going to replace a Shimano 52-39-28 (small ring was changed from original) crankset on a touring bike with either a 48-36-26 or 44-32-22 Shimano crankset. Everything is 9 speed so I'm presuming that derailleurs already on the bike (105 front and Deore back) will be compatible.

1. It looks simple enough to do myself but I'd need a crank puller and a torque wrench. I'd likely never use the crank puller again and would likely use the torque wrench only occasionally. Is it worth buying the tools or is it better to have a shop do it? (I also recognize that a shop will give some sort of labor guarantee.)

2. What would be a reasonable shop cost?

3. The difference in granny gears would be 20.8 gear inches v. 17.6 gear inches. Will a 3.2 gear inch difference be barely noticeable or will it make a huge difference? (Hills and I don't often get along.)

Your input is appreciated.
Thank you.
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Old 08-30-14, 04:42 AM   #2
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1. I wouldn't bet on your existing bottom bracket having the right spindle length for the new crankset - but it might.

2. I'd GUESS that a fair labor charge would be in the $30.00 to $50.00 range. Besides installing the crankset and sizing the chain there will be some front derailleur fiddling required.

3. 17.6 is 85% of 20.8. That's enough of a difference to notice.
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Old 08-30-14, 10:34 PM   #3
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You will feel the difference, I'm sure. But if you're even a little serious about cycling, don't assume you won't use the crank puller again. There's no substitute for them, and they only cost, what, $12 or $14 now (I've had mine for years)? You'll need them for maintenance and to change rings when they wear out. I'd rather do without a torque wrench than a crank puller.
As an aside, I'd go with the 22-tooth granny. I'm old and live in big mountains, so you may not need it as much as I do, but there's no disadvantage to having it. I have a 46-36-26 on my Atlantis, and I wish I could go lower a lot more often than I wish I could go higher.
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Old 08-31-14, 05:14 AM   #4
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I agree with the above two responses. If consider 48/38 or 36/22 {I run a 48/38/22).
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Old 08-31-14, 05:29 AM   #5
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FWIW, the short wheelbase recumbent in my avatar has a 48-32-22 crankset. I think of it as a compact double with a bail out granny that I seldom use. The front shifter is friction which I greatly prefer for wider-than-typical chainring gearing.
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Old 08-31-14, 09:14 AM   #6
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You may also need to change out the front derailleur. But change out the crankset first and see if you can dial it in. On mine, I am running an XT FD built for a large 46 chainring. I changed my crankset to a 48/36/26 and it stills shifts, but there is a hitch going from the 36 to 26. Not enough to bother me too much but it's there. Going up it shifts like great though. It took quite a bit of tuning to get it to work almost right.
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Old 08-31-14, 09:43 AM   #7
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2. What would be a reasonable shop cost?

buying the Shop? it include the building it's in?


How much will it cost where I dont Live & have never been? it's a Bike Shop manager's decision , ask the place doing the work.

shipping it across the country twice to where I Am will be expensive. + the repair work, parts cost ..
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