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I have a very basic Specialized Allez (XL frame) street bike (pictured in my avatar) with a cheap SG B52/39 chainring needing replacement (warped and wearing out after two years of daily use).

But here in Costa Rica the LBS can't seem to find a replacement chainring the same size as I have. They only offer me compact cranksets which I don't accept since I already max out on the flats to the the 52T/12T top gear combination. Therefore I need to figure out what chainring/crankset to order myself the US online.

Unfortunately, I don't know what to order that will fit (something one tends to rely on the LBS to get right) my bike as it is.

So I'm coming to y'all. What do you recommend I get? Here's my details:

  1. Teeth: I learned from this article that there are racing, compact and even mid-compact chainrings. I think I prefer the mid-compact of 52/36T. If not possible, a racing of 53/39. Are both possible?

  2. Crankshaft: Also, my current crankshaft is 170mm and I don't know if that's what I should get on the next chainring. I am 6' tall and have a 33-34" inseam.

  3. Quality: My focus is durability; I ride every day. I don't want to pay a lot for something light since I'm not racing but I also don't want another cheap chainring that bends easily like the stock one did.

I'm hoping you can recommend an exact model chainring or crankset and maybe even where the best place to mail order it is (to a US address from which someone will bring it down to me).

Thanks in advance.

P.S. In case it matters, the stock 8-speed cassette in the back seems fine (Shimano CS HG50 12-25T). I also have a new Shimano Sora RD-3500 rear derailer doing well. The front derailer is the stock Shimano Sora FD-3400

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  • Your bike sounds pretty standard to be honest. Your best bet is to look at the Shimano web site, I would be surprised if you can't find everything listed on there in the USA. Certainly 52/39 is a standard combination. – PeteH Feb 21 '15 at 14:10
  • Thanks, but I don't know what standard means. What would help is to know specifically what I have now for a crankset (2200? 2300?) and what I should aim for (Sora? but Sora does not list a 52T crankset. Nor does Claris) 2300 may be what I need as it lists a 52T model? – Avimelech Feb 21 '15 at 14:23
  • By standard, I mean that your requirements can probably be satisfied by a number of parts. If the cranks don't exist in the Sora range, try looking up the ranges - Tiagra, 105, Ultegra, Dura Ace. The only thing you need to be aware of is that cranks are built for a certain speed (e.g. 10-speed) and the manufacturers recommend matching this speed with the number of gears on your cassette. The trouble with this question is that it sounds very much like you're looking for a product rec, and such questions are off-topic on this site. – PeteH Feb 21 '15 at 14:35
  • Oh! yes I am but thanks for the gentle correction on that. I guess I should delete my question? And thanks for the tips. – Avimelech Feb 21 '15 at 14:40
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    Thank you! Yes, naughty indeed. So this explains all the trouble I'm having and why I've seen glimpses of exact replacement parts only on eBay! – Avimelech Feb 21 '15 at 14:57

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