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Old 06-07-11, 08:05 AM   #1
Marauder9
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Difference between Tiagra and 105 cranks?

I am in the process of upgrading all my bike components from Sora to Tiagra and just need a crank then I am done (for now ).

I have been looking on Ebay for some cheap, little used cranks for my road bike but there isn't many Tiagra cranks available but lots of 105's.

Is there any difference in teeth space, size of rings etc between the two?
I already have a Tiagra bottom bracket, will this be compatible with 105?

I already have Tiagra shifters, FD and RD and chain as well as the BB.
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Old 06-07-11, 08:52 AM   #2
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Sora, and Tiagra cranks are intended for mtb, and 105 is a road crank. However the advent of "compact" road cranks with 110mm or smaller bolt circles, and road triples blurs the lines somewhat.

There may be a difference in chainline and suggested spindle length between the road cranks and mtb series cranksets, so visit the Shimano site, or ask questions to make sure the cranks are suited to your needs and will fit correctly with your BB.
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Old 06-07-11, 09:37 AM   #3
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Quote:
Originally Posted by FBinNY View Post
Sora, and Tiagra cranks are intended for mtb
No, Sora and Tiagra have always been Road groupsets, Atlus, Acera, Alivio, Deore, SLX, XT and XTR are MTB

For the question of upgrading Sora to Tiagra, it isn't worth it, Tiagra is only one group above Sora, and offers no major benifits except for the shifters which are a worth while upgrade. for sizing difference, on the basis you are getting say a 50/34, there will be no sizing difference

The reason you are seeing lots of 105 on ebay, is no one really want's anything lower than this, the lower groupset arn't really sold in the UK as aftermarket parts, they don't get sold, as very few people would buy them.
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Old 06-07-11, 09:37 AM   #4
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Originally Posted by FBinNY View Post
Sora, and Tiagra cranks are intended for mtb, and 105 is a road crank.
I don't think this is correct. Shimano lists both groups under their "road bike" product lines and the both model cranks have a single 110mm BCD for their compact doubles, 130 mm BCD for the Tiagra standard double and 130/74 for both model triple crank bolt circles. Sounds pretty roadie to me.
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Old 06-07-11, 10:14 AM   #5
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Tiagra cranks are not hollow, but 105s are. You probably will not notice a difference between them. However, if the price difference is not significant, and you can find more 105, just go with that. Nice stuff is nice
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Old 06-07-11, 10:47 AM   #6
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Another quick question that I have thought of.

I have a 9 speed cassette. There are a few 105 cranks available which state 10 speed. Will they still be compatible?


Thanks for all your help. Appreciated
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Old 06-07-11, 10:58 AM   #7
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Yes it will work fine u will have to get a new bottom bracket to work with the crank- call local bike shop; to help with what size u need or have them order it.
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Old 06-07-11, 09:40 PM   #8
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Originally Posted by Marauder9 View Post
I already have Tiagra ... BB.
Which type of BB? Tiagra has transitioned (quite recently!) from square taper (cartridges), to Octalink (cartridges), and finally to external bearings w/ a two piece crank design.
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Old 06-08-11, 08:07 AM   #9
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BB is an external.
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