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Shimano Tiagra gearing

Old 06-15-16, 02:27 AM
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mikedefieslife
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Shimano Tiagra gearing

I'm planning on using my road bike for touring northwest France this comming July.

The bike has a Shimano Tiagra gearset with an 11-28 cassette, and FSA crankset in a 50/34 combination. This gives me 32-119 gear inches, which is doable but I could always use a little extra help on the hills.

Shimano do a 11-32 and 11-34 cassette under the Tiagra name. I'm wondering if I could fit one of these without any modifications to the derailleur.

Even better if I could then find a 30T five bolt chain ring for the front too. That combination would get me down to 23" which would be perfect.
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Old 06-15-16, 02:49 AM
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You probably have a 110bcd crankset. So, 34T, or maybe 33T is the smallest you can go. For smaller chainrings, you'd probably have to change cranksets to a triple.

Here are the Tiagra specs.
RD-4700-GS

They should support a 34T rear cassette. Also 39T to 41T total chain wrap.
(50-34) + (34-11) = 16+23 = 39T. and it should be supported by your derailleur. Anyway, you're close enough that it is worth trying out..
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Old 06-15-16, 08:06 AM
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wear shoes you can walk in .. savor the places you walk, even if they are up a hill ..

Massive Central and the Alps your route? No? may not need Alpine gears..

30t is a triple crank 3rd ring .

swapping a MTB long cage RD on is no big deal as long as its Same brand.

Last edited by fietsbob; 06-15-16 at 08:10 AM.
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Old 06-15-16, 12:11 PM
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Leaving the chain rings as they are, it's been suggested that I can run a Shimano XT 11-36 10 speed cassette, but need a MTB 9 speed derailleur. Problem with that is don't know which model derailleur I'd need to get.

To keep things simple I think I'll just get the Tiagra 11-34 cassette, if that should work without (much) hassle, which @CliffordK above thinks it should do.

The route is through Normandy and Brittany. So shouldn't be too bad. I have recessed cleats that i'll be using. They are fine for walking.
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Old 06-15-16, 01:05 PM
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Originally Posted by mikedefieslife View Post
Leaving the chain rings as they are, it's been suggested that I can run a Shimano XT 11-36 10 speed cassette, but need a MTB 9 speed derailleur. Problem with that is don't know which model derailleur I'd need to get. .........
Mike; a Shimano M592 will do the job with an 11-36.
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Old 06-15-16, 01:17 PM
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I'm getting the impression from your other thread that it will be light touring, and relatively short distances per day. Don't be afraid of climbing the occasional hill out of the saddle and you'll be just fine.
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Old 06-15-16, 01:52 PM
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How low do you think you need? Going a little lower, like one or two shifts, is easy, it's just the cassette and maybe a longer chain. Your RD is rated for 11-32, and you can probably cheat on an 11-34 or 12-36 cassette. You have several things limiting you from going a lot lower, and in order to get gears like a hybrid or trekking or even lower like a MTB you'd need to replace a lot of your drivetrain.
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Old 06-15-16, 05:38 PM
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i have two Tiagra square taper cranksets that have a small diameter inner bolt cricle that'll take 24 - 28 teeth chainrings. they were sold to me as 42 - 52 doubles but have the mounts and threaded holes for that small inner triple ring. maybe you can find one of those?

Cheers
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Old 06-16-16, 01:27 PM
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Well. I had some short time on the bike today, and really enjoyed it. I can see myself using it more and more. Even clmibed my favourite hill, albeit 6 seconds off my best time.

Typically I ignored all advice and bought the following:

Shimano SLX HG81 10 Speed CassetteShimano XT M772 Shadow 9 Speed Rear MechShimano Ultegra 6701 10 Speed Chain



Looks like I'll have some fun seeing if it all fits together, when it arrives next week.
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