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Clydesdales/Athenas (200+ lb / 91+ kg) Looking to lose that spare tire? Ideal weight 200+? Frustrated being a large cyclist in a sport geared for the ultra-light? Learn about the bikes and parts that can take the abuse of a heavier cyclist, how to keep your body going while losing the weight, and get support from others who've been successful.

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Old 07-15-13, 10:23 AM   #1
briedel
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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!
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Old 07-15-13, 01:47 PM   #2
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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.
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Old 07-15-13, 02:29 PM   #3
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Are you looking to replace just the crank set or entire drive train?

The 105 series is good quality.
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Old 07-15-13, 02:53 PM   #4
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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?)
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Old 07-15-13, 03:10 PM   #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.
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Old 07-15-13, 03:23 PM   #6
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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.
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Old 07-15-13, 03:23 PM   #7
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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.
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Old 07-15-13, 03:47 PM   #8
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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).
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Old 07-15-13, 03:59 PM   #9
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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.
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Old 07-15-13, 04:06 PM   #10
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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!
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Old 07-15-13, 04:15 PM   #11
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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.
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Old 07-15-13, 09:25 PM   #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.
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Old 07-16-13, 11:24 AM   #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.
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Old 07-16-13, 05:29 PM   #14
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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.
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Old 07-16-13, 06:54 PM   #15
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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
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Old 07-18-13, 09:53 AM   #16
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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
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
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Old 07-18-13, 01:57 PM   #17
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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.
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Old 07-18-13, 02:07 PM   #18
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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..
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Old 07-18-13, 10:09 PM   #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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