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  1. #1
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    Need to replace crankset... Shimano Tiagra or 105 or other suggestions?

    Hi all,

    I need to replace the crankset on my Raleigh Sojourn because I have worn out the standard one. I am 6' 7" and around 240 to 250. I was thinking about going to to 53-39 instead of my current 50-39-30. I have only used the 30 once in the 3 years that I have owned the bike, so I don't see the point in having it anymore. I was thinking about either the Shimano Tiagra or 105, but I haven't been able to find anything about how they hold up for stronger/heavier riders.

    Thanks a lot!

  2. #2
    SuperGimp TrojanHorse's Avatar
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    What did you wear out on your crank? the bottom bracket? the chainrings? Or the whole flipping thing?

    First find out what kind of bottom bracket you have and then pick the crank from there. 105 is probably perfectly fine.

  3. #3
    Getting older and slower!
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    Are you looking to replace just the crank set or entire drive train?

    The 105 series is good quality.

  4. #4
    Senior Member volosong's Avatar
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    Yeah, 105 is good stuff. You won't go wrong with it. (Personally, I don't care for Tiagra very much, but that's just me.)

    It sounds like you want to go from a triple to a double. Keep in mind that not only are you going to have to replace the crankset, but also the shifter. That's a couple hundred bucks more. If you can live with your triple, and the chainring is all that is worn out . . . just replace the ring. (Other than the chainring, how does one wear out a crank arm? Is it even possible?)
    Deut 6:5

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    "Ha ha! You fool! You fell victim to one of the classic blunders - The most famous of which is 'never get involved in a land war in Asia'".
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  5. #5
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    Then there's the issue of is the chain worn out (stretched), then the cassette, etc., etc.

    +1 to Volosong, just get a new large chainring. Search BCD chainring bikeforums via google.
    Life is like riding a bicycle. To keep your balance you must keep moving. Albert Einstein
    2014 Additions: 1985 Trek 560, 1992 Trek Multitrack 700 (my 2nd), 1994 Trek Carbon 2200, Peugeot PX-10, 1981 Schwinn Voyager, 1989 Bridgestone RB-1

  6. #6
    Senior Member tunavic's Avatar
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    Good topic and I also could use some advice.

    This is one of my bikes: http://www.bikepedia.com/QuickBike/B...e#.UeRnCmTF3UM

    Would it be possible to replace the entire drivetrain with 105 compact (including the brifters) at a reasonable cost.

    I love the bike. It's very comfortable to ride but the shifting is really hokey. It's adjusted properly according to two mechanics that have looked at it and when on a bike workstand it shifts ok but while riding sometimes shifting the front requires two or three attempts before it happens.

  7. #7
    SuperGimp TrojanHorse's Avatar
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    Quote Originally Posted by volosong View Post
    Yeah, 105 is good stuff. You won't go wrong with it. (Personally, I don't care for Tiagra very much, but that's just me.)

    It sounds like you want to go from a triple to a double. Keep in mind that not only are you going to have to replace the crankset, but also the shifter. That's a couple hundred bucks more. If you can live with your triple, and the chainring is all that is worn out . . . just replace the ring. (Other than the chainring, how does one wear out a crank arm? Is it even possible?)
    It's probably worth noting that triple shifters usually have the ability to "lock out" the third position, so you may not need new shifters.

  8. #8
    Senior Member volosong's Avatar
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    Quote Originally Posted by tunavic View Post
    Would it be possible to replace the entire drivetrain with 105 compact (including the brifters) at a reasonable cost.
    Depends on what you mean by "reasonable". The swap can certainly be done. It's sure a lot less expensive than getting a whole new bike. Depending on your budget, consider going Ultegra 6700. With 6800 just hitting the marketplace, expect prices on a 6700 group to decrease. (Ultegra is the sweet spot in the Shimano line. The best 'bang for your buck'.)




    TH, thanks for the additional info on the shifter. I didn't know one could do that. I stand corrected, (for the umpteenth time).
    Deut 6:5

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  9. #9
    Senior Member tunavic's Avatar
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    Thanks for the advice volosong.

    I like the bike a lot. It's real comfortable to ride and that has me thinking to upgrade it. I've read a lot of riders don't care for the thumb type shifters but they don't bother me. The shifting however is not very good.

    I'll keep and eye open for a deal on Ultegra 6700.

  10. #10
    SuperGimp TrojanHorse's Avatar
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    Good lord Vic, how many bikes do you have?!! Anyway, you can find a complete 105 groupset for roughly $500 (new) if you look. Here's one spot. http://www.ribblecycles.co.uk/gsg/ro...RIBMO&tmp=_CAR

    Ultegra is another $250 or so if you want to splurge, and the nice thing about buying a complete group is you don't get the el-cheapo OEM cranks and brakes.

    I typically replace either the frame or the group and haven't bought a complete new bike since 1992. I get sticker shock just looking at new bikes!

  11. #11
    Senior Member tunavic's Avatar
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    Quote Originally Posted by TrojanHorse View Post
    Good lord Vic, how many bikes do you have?!! Anyway, you can find a complete 105 groupset for roughly $500 (new) if you look. Here's one spot. http://www.ribblecycles.co.uk/gsg/ro...RIBMO&tmp=_CAR

    Ultegra is another $250 or so if you want to splurge, and the nice thing about buying a complete group is you don't get the el-cheapo OEM cranks and brakes.

    I typically replace either the frame or the group and haven't bought a complete new bike since 1992. I get sticker shock just looking at new bikes!
    Thanks TH. I'm ordering the entire group now.

  12. #12
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    Again I think 105 is good quality stuff. I have 105 on my cychocross bike (errand and MUP ride) and when my Dura Ace needed replacing, I went Ultegra on my Madone. I recommend going 105 or above.

    In buying the entire group, you now can think about going compact. I like it.

  13. #13
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    The issue is that I get this creaking noise whenever I sit down and paddle hard, like up hills. A mechanic and I looked at it and tried tightening everything up and it didnt really go away.

    Quote Originally Posted by TrojanHorse View Post
    What did you wear out on your crank? the bottom bracket? the chainrings? Or the whole flipping thing?

    First find out what kind of bottom bracket you have and then pick the crank from there. 105 is probably perfectly fine.
    I ride in the 50 ring a lot because it is most comfortable for me.

    I think the chainrings are going for good. The bottom bracket still looks good even according to the mechanic.

    Quote Originally Posted by Cychologist View Post
    Are you looking to replace just the crank set or entire drive train?

    The 105 series is good quality.
    Just the crankset. It should work with the back, since I just need one that works with a 9-speed.

    Quote Originally Posted by TrojanHorse View Post
    Good lord Vic, how many bikes do you have?!! Anyway, you can find a complete 105 groupset for roughly $500 (new) if you look. Here's one spot. http://www.ribblecycles.co.uk/gsg/ro...RIBMO&tmp=_CAR

    Ultegra is another $250 or so if you want to splurge, and the nice thing about buying a complete group is you don't get the el-cheapo OEM cranks and brakes.
    I only really need the drive set and not a whole group. I have disk brakes on the bike and I cant really see myself going back to normal brakes.

  14. #14
    Senior Member Black wallnut's Avatar
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    Your bottom bracket may be slightly different in width. Yes you can just hang a double on there and adjust the shifters and derailleur. Changing to a 53/39 may or may not be a problem depending on your FD mount, will it go higher on the seat tube.
    Last edited by Black wallnut; 07-16-13 at 11:57 PM.


    Mark

  15. #15
    SuperGimp TrojanHorse's Avatar
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    Well, as a money saving maneuver you could just replace the chainring, and you can probably get a 52 instead of a 50 if you are so inclined. I don't know what the BCD is on triple cranks but they do make 52 tooth rings in a 110 mm bcd

  16. #16
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    Quote Originally Posted by TrojanHorse View Post
    Well, as a money saving maneuver you could just replace the chainring, and you can probably get a 52 instead of a 50 if you are so inclined. I don't know what the BCD is on triple cranks but they do make 52 tooth rings in a 110 mm bcd
    I think it is more than just the chainring. It makes a creaking sound when I am in the middle or lower ring. I think the whole assembly is just worn out

  17. #17
    Senior Member Black wallnut's Avatar
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    Are the chain rings excessively shark-finned/ How is your chain and cassette, have you replaced either/ both? Have you and or the mechanic checked that your saddle rails and seatpost are greased? creaking noises from the crank or bottom bracket are not always what they sound to be. A 105 crankset would be plenty durable for a rider of your size weight.


    Mark

  18. #18
    SuperGimp TrojanHorse's Avatar
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    I would think creaking would be a BB problem but you said the shop said it was fine. Worn chainrings might lead to shifting problems or skipping chains.

    Regardless, if you replace the crank, replace the BB and check the chain / cassette for wear, as Blackwalnut mentioned..

  19. #19
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    My FSA SLK Carbon Compact Crankset has been rock solid for me. I'm 265 now but started at 285. Doesn't bat an eye when climbing. Mine is w/ the MegaExo BB.

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