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  1. #1
    Join Date
    Sep 2007
    Location
    Boston, MA
    Posts
    646

    Question Crankset change--advice appreciated!

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    So after tweaking my fit, I've decided I want to try a shorter crank length since the longest part of my leg extension is not at the bottom of my stroke.

    I want a 165mm and have a 170mm. I want some advice about getting it switched since I am not yet handy (or properly equipped) to do it myself.

    I only have one nice road bike and have no need for a 170mm crank (after all, I'm only 5'3" with a "long torso for my height" which translates into short legs). My bike is Shimano 105 triple and is only 18 months old and has less than 1,000 miles on it. I change the chain regularly so I think it's in pretty good shape. I want to keep it at Shimano 105 or better and I know labor will need to be done but I want to stay around $200 or less. What is the standard protocol? Can I ask for a credit for the crankset and let them keep it or should I keep it and try to sell it myself?

    And if so, how much credit do you think would be reasonable?

    What is the best thing to do?

    Any stories of others who have had their cranks changed? It's a huge hassle for me to do this since I do not own a vehicle so I can't do a lot of shopping around but there is a shop I prefer.
    Ana
    * * * * * * * * * * * * * *
    2009 Lynskey R230
    Trek Mountain Track 850

  2. #2
    Join Date
    Mar 2006
    Location
    St. Louis, MO
    Posts
    612
    You said this was a triple - is it a compact triple (50-39-30)? Or is it a traditional triple - 52-42-30?

    1000 miles on the crank set will have scratches and scuffs. A shop will not be able to sell the crank set as new. If you can get credit, I would request $150. If they aren't willing to go for credit then I would suggest you try selling it for the same amount.

  3. #3
    Join Date
    Sep 2007
    Location
    Boston, MA
    Posts
    646
    Um...

    I think it's a standard triple (52-42-30). I didn't know they made compact triples!

    Thanks so much!

    Do I need to worry about the bottom bracket or can I keep the one I have?
    Ana
    * * * * * * * * * * * * * *
    2009 Lynskey R230
    Trek Mountain Track 850

  4. #4
    Join Date
    Aug 2003
    Location
    Bendemonium
    Posts
    9,684
    Your shop will be able to advise you on a compatible crankset with the existing bottom bracket.

    I don't think you'll get anywhere near $150 for that crank. Look at ebay for comparative values. There is a brand new one on there with a starting bid of $89 with no bids. There is a used one with two bids currently about $27.

    A question: why are you already changing the chain? You should be able to get 1,500 to 3,000 miles depending on how you clean/lube the chain and your size.
    Frends know gud humors when dey is hear it. ~ Da Crockydiles of ZZE.

  5. #5
    Join Date
    Aug 2003
    Location
    Bendemonium
    Posts
    9,684
    Quote Originally Posted by bike4ever View Post
    You said this was a triple - is it a compact triple (50-39-30)? Or is it a traditional triple - 52-42-30?
    Compact refers more to the BCD or bolt center diameter which allows you to use smaller rings.

    The two cranksets you mention are probably both 110/74 or 130/74 BCD (bolt center diameter), the same crank size but running different size chainrings.

    Compact triples run smaller BCDs (such as mtb cranks and touring triples from Sugino and TA) and allow you to use much, much smaller rings (for instance 20-22 tooth inner ring).

    http://www.sheldonbrown.com/gloss_bo-z.html#bcd
    Last edited by SadieKate; 11-15-2008 at 08:29 PM.
    Frends know gud humors when dey is hear it. ~ Da Crockydiles of ZZE.

  6. #6
    Join Date
    Sep 2007
    Location
    Boston, MA
    Posts
    646

    Oh wait!

    I just examined them up close and the outer ring says Shimano 50-D (or 0, I can't tell which one it is) so I think it's a compact It makes sense since I'm such a small person and the bike is small.

    I had no idea this was going to require so many details I'm learning new things about bike components every day!

    I guess I'll be headed over to my LBS to ask them about it

    Thanks for all your help
    Ana
    * * * * * * * * * * * * * *
    2009 Lynskey R230
    Trek Mountain Track 850

  7. #7
    Join Date
    Aug 2003
    Location
    Bendemonium
    Posts
    9,684
    Read my post above about compact cranks. A 50T outer ring does not necessarily mean you have a "compact" crank. Compact is the bolt center diameter.

    There are and were plenty of standard triple cranks with 50T outer rings.
    Frends know gud humors when dey is hear it. ~ Da Crockydiles of ZZE.

  8. #8
    Join Date
    Sep 2007
    Location
    Boston, MA
    Posts
    646

    Specs

    I also found the original specs for my stock frame which is a Shimano 105 50-30-30
    Ana
    * * * * * * * * * * * * * *
    2009 Lynskey R230
    Trek Mountain Track 850

  9. #9
    Join Date
    Jul 2006
    Posts
    1,047
    Be sure to get yourself fit/measured before investing in a 165. I am 2"
    shorter than you (also with short legs) but need a 167.5 crank arm.

  10. #10
    Join Date
    Sep 2007
    Location
    Uncanny Valley
    Posts
    14,645
    I swapped my 105 cranks out brand new and the LBS wouldn't give me a credit. I'm guessing the new one on eBay was the same story. Some LBS's will credit you when you're buying the bike new, but cranks aren't a normal wear item and they're pretty difficult to sell. I can't imagine a shop giving you any credit for a used one unless they sell a lot of used parts anyhow.

    I just took the chainrings off my 170mm crankset and gave the cranks away. What I would've been able to get for the crankset brand new with the chainrings, was less than new chainrings would've cost me when it came time.

    And yeah, why are you changing the chain already, and what do you mean by "regularly"???
    Speed comes from what you put behind you. - Judi Ketteler

  11. #11
    Join Date
    Sep 2007
    Location
    Boston, MA
    Posts
    646
    Quote Originally Posted by Bluetree View Post
    Be sure to get yourself fit/measured before investing in a 165. I am 2"
    shorter than you (also with short legs) but need a 167.5 crank arm.
    I heard 167.5 is hard to find so I didn't really consider it as an option

    My geometry is such that I have to put my seat farther back than I thought but I'm sort of avoiding getting fit because I don't want to make a huge investment right now (fit = $150-$200 + components =$200-$50). Plus it's winter and my beauty is on the trainer

    I think I would ride my bike more if it was more comfortable. The trainer is easier to be comfortable than on the road (plus I can get off at any time).

    Maybe it could be my early holiday present to myself...
    Ana
    * * * * * * * * * * * * * *
    2009 Lynskey R230
    Trek Mountain Track 850

  12. #12
    Join Date
    Sep 2007
    Location
    Boston, MA
    Posts
    646
    Quote Originally Posted by OakLeaf View Post
    And yeah, why are you changing the chain already, and what do you mean by "regularly"???
    Oh right, that. I was advised to change it by my LBS....so I did Since then I researched it myself and am monitoring it (Sheldon Brown's handy 0.5" between the links) since I do not have a chain tool.

    I just thought I'd mention it so you knew there would be minimum damage to the teeth
    Ana
    * * * * * * * * * * * * * *
    2009 Lynskey R230
    Trek Mountain Track 850

  13. #13
    Join Date
    Aug 2008
    Posts
    2,845
    I'm 5'1, 29 inch inseam, and I ride 165's. I haven't tried a 167.5, but I definitely don't like 170's - they hurt my knees.

    You can sell your old cranks on ebay or via your local craigslist. I wouldn't expect to get more than $100 or so for them if that.

  14. #14
    Join Date
    Feb 2005
    Location
    Concord, MA
    Posts
    13,099
    I've always had 165s. Also am 5' 1" with 28.5 inseam. When my Kutoa got built up, they "tried" to convince me I would become a "wild devil" and climb like the wind with 170s. One ride with those cranks, sent me right back to the shop. I felt like I could barely push the pedals. I like to spin and I guess they couldn't believe that. It took 2 weeks to get my 165s, but they did it.

  15. #15
    Join Date
    Sep 2007
    Location
    Boston, MA
    Posts
    646
    My inseam is about 28.5 inches too! I'm not a good climber and I feel like it's a bit difficult to push the pedals

    I'll look into 165mm. . .
    Ana
    * * * * * * * * * * * * * *
    2009 Lynskey R230
    Trek Mountain Track 850

 

 

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