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Can I use Tiagra Chainset on a mountain bike?

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Can I use Tiagra Chainset on a mountain bike?

Old 12-19-09, 11:22 AM
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Recess
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Can I use Tiagra Chainset on a mountain bike?

So, as it stands, I know I can't use a 105 double on my Giant Terrago. Bottom bracket fits fine, cranks attach fine - but unfortunately, the cogs themselves rub off the frame of the bike.

So - I'm thinking that maybe as the old chainset was a triple, that i need to go triple again for this to work. So I'm looking at Tiagra 4503 triple to replace the old busted nonsense that's on it at the minute (a hastily added Suntour number).

Is this a bad idea? I'm talking more mechanically that functioanally. I use this bike as my daily commuter - and the most off-road it ever gets is canal paths. So I'm not that concerned about durability of using Tiagra - more wondering if I'll go through the same problem.

Any insights greatly appreciated.

John.
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Old 12-19-09, 11:30 AM
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its the ring size thats going to get you in trouble. lots of mountain bikes dont have the clearance for a 53t chainring.
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Old 12-19-09, 11:59 AM
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Ah - I figured a triple would have the larger ring further out from the middle, clearing the chainstay bar it keeps dragging against. The one I'm looking at is this one: https://www.chainreactioncycles.com/M...?ModelID=21876 with a 30/39/50 configuration. The last one I used was 48 - but I guess I'll have to work out sizes before I know any more.

Thanks for your help - any other thoughts?

J
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Old 12-19-09, 12:42 PM
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Get a bottom bracket that has a slightly longer axle if this is the regular taper style BB and crankset. The old style sealed taper units came in different widths for both the shell and the axle. I'm not sure what this will do for the chainline issues though. But if you get the one that sits the second ring close to the stay it should come out not too badly.

Do you really think you need a 53 tooth? That's only really needed if you're belting along at some fairly high speeds. Not the sort of riding that many folks can do unless they are bent over into a nicely aero position.
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Old 12-19-09, 01:21 PM
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Hmm - well, it's the Hollowtech style BB that I got with the 105 chainset, so I'd really like to hold onto it so I'm not wasting money. Not sure if it's possible to lump out the ring side unfortunately.

however, the one I'm looking at is a 50 tooth on the big-ring (I agree with your thinking - a 53 tooth on a mountain bike is probably like sticking a ferrari engine in a traktor...

Well, not quite...

I'll hold off and call the store unless i hear any other ideas on this.

Thanks again.

J
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Old 12-20-09, 02:21 PM
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No it will not work without a lot of bodging. However, i have seen a 50t chainring on a MTB bike, we call this guy frankenstein for obvious reasons..
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Old 12-21-09, 04:32 AM
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Yeah, I spent the weekend looking into this a lot more, and found out pretty much the same thing. So, I've just ordered an XT 761 triple instead (26/36/48) which I hope will fit, as the old one was a 48 on the big ring too. All I have to replace on the Giant now is the seat-post and saddle, and the only thing that was original on it will be the frame.

Time to start looking for a frame...

Thanks for all your help everyone, Merry Christmas.

John
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Old 12-21-09, 06:49 AM
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I've come to this thread late but for the record I will add that I have used a Tiagra road triple on a MTN bike and it worked fine. Yes you have to set the front derailer up higher than its designed to work and yes its not the best shifts you've ever had but it does work.

Anthony
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Old 12-21-09, 07:18 AM
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Originally Posted by BCRider View Post
..Do you really think you need a 53 tooth?
+1

A regular MTB gearing will take you to something like 25 MPH/40KMH before spinning out, anybody doing the bulk of his commuting above that range should probably think about bike riding as a career...

The only time large chainrings and commuting would really go well together would be for someone wanting to run bigger small sprockets for better durability.
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Old 12-21-09, 08:01 AM
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People use Tiagra FD's with 48-36-24 gearing for touring when they want to run STI controls along with XT (or similar) RD's with 9 spd 11-32 or 11-34 cassettes. IRD makes a couple of derailleurs to help here and one is for a triple chain ring set up. Shiftmate offers some help depending on what you want to end up with.
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Old 12-21-09, 12:49 PM
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So my drivetrain knowledge is almost exclusive to past-generation square-taper components, but don't you automatically need a longer bottom bracket spindle for a mountain BB shell? It's 73mm vs. 68, no?
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Old 12-21-09, 03:08 PM
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Your'e right tellyho. So there's room for some confusion here. That and the fact that there's been hollowtech crankarms available in all three formats, square taper, Octalink and the new fixed axle style cranksets. If it's a square taper setup then the bottom brackets came with a variety of axle lengths as well for each of the two shell lengths. Only the Octalink and new fixed style are fixed to one width.
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