compact crankset for sport touring build
09-09-21, 11:32 AM
#1
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Thread Starter
compact crankset for sport touring build
hello all,
picked up a Soma Stanyan 18 that I'd like to build up as a sport/touring bike (700x35). I climb a lot, 50+ yrs, and so i like the idea of compact crankset & like the IRD Defiant 46/30. Issue is it comes in Wide Double Compact (w/ 110 BCD for outer ring & 94 BCD for inner ring), and a "conventional" Double Compact w/ 94 BCD for outer/inner ring. Being that they are "mechanically" different, is there any advantage to one over the other?
Thanks, Christian
picked up a Soma Stanyan 18 that I'd like to build up as a sport/touring bike (700x35). I climb a lot, 50+ yrs, and so i like the idea of compact crankset & like the IRD Defiant 46/30. Issue is it comes in Wide Double Compact (w/ 110 BCD for outer ring & 94 BCD for inner ring), and a "conventional" Double Compact w/ 94 BCD for outer/inner ring. Being that they are "mechanically" different, is there any advantage to one over the other?
Thanks, Christian
09-09-21, 12:27 PM
#2
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mechanically, there's no advantage either way. it might be argued that the 110bcd outer ring might be a tad stiffer for hard cranking, but i've not found that to be remotely important. convenience wise, it's a convenience to buy replacement rings in the future having the same bcd for both rings, but 110bcd are also readily available, too. so, that's really moot
09-09-21, 12:43 PM
#3
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I don't think this is entirely correct... What I see is that the Defiant can be found as a 50/34 double, which has the 110mm BCD, and also as a 46/30 double, which has the 94mm BCD. Is there a reference to where it has both BCDs on one crankset?
You might also check out the Velo Orange 46/30, which uses the 50.4mm BCD. You can't mix and match TA and Velo Orange chainrings (as far as I can tell in my attempts to mix/match), but if you use TA rings, you have a very wide range of gearing available to you.
You might also check out the Velo Orange 46/30, which uses the 50.4mm BCD. You can't mix and match TA and Velo Orange chainrings (as far as I can tell in my attempts to mix/match), but if you use TA rings, you have a very wide range of gearing available to you.
09-09-21, 12:48 PM
#4
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I think the one with the 110 BCD outer ring and 74 BCD inner ring goes by another name... <checks google> "Lobo"? It also uses an external bottom bracket, so that's the appeal of that one.
As far as replacement rings, I think the lesson we're learning is to buy them ASAP if you have any doubts.
As far as replacement rings, I think the lesson we're learning is to buy them ASAP if you have any doubts.
09-09-21, 12:55 PM
#5
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I think the one with the 110 BCD outer ring and 74 BCD inner ring goes by another name... <checks google> "Lobo"? It also uses an external bottom bracket, so that's the appeal of that one.
As far as replacement rings, I think the lesson we're learning is to buy them ASAP if you have any doubts.
As far as replacement rings, I think the lesson we're learning is to buy them ASAP if you have any doubts.
09-09-21, 01:42 PM
#6
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I use old sugino 94-58 mountain cranks for touring sometimes and I love the selection of 94mm bcd rings. I've got a 29 in that size. Pairs with a 46 it would be very nice.
09-09-21, 01:58 PM
#7
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09-09-21, 06:27 PM
#8
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yes, on the description for IRD Defiant Compact it has the BCDs listed. One has 1 set of bots (94 bcd) while the other, they call "double wide" has 100bcd & 94 bcd
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