Crankset Weight Triple Conversion vs. Double
Why does it seem that a triple crank, converted, is less weight than a similar double?
Example: SRAM X0 Triple, no BB, = 705 grams. (= 625g converted)
SRAM X0 Double, no BB, = 700 grams.
Umm, you lose the big ring, so what's up?
I'm thinking the smart solution is to buy a triple, and do a simple conversion. Looks 75g less rotating weight in the end, weighs 705 - big ring(80g?), and Q is all good(for me at least)? Yes, the weight matters to me, I'm a WW. ((Please don't just say the old blah, blah, weight is overrated argument, etc. (unless you're being facetious, that is awesome) I get it if you don't care, but I do. Cheers!))
Why? Or am I totally misunderstanding something about crankset weights?
Are you factoring in the same chainring sizes?
Taking a triple 44/32/22 and just dropping the big ring is gonna be lighter than a double with 39/26.
I resolve to constantly assert my honest opinion on anything and everything - whether it is requested or not.
Bucky the Cat
Yes on the ring sizing.
I'd buy a 44/32(or 34)/22, and convert to 34/22. Lots of massive inclines where I live.
Sure, it works fine.
Consider replacing the big gear with a bash guard if you prefer, or keep the big ring as a bash guard.
Most MTN bikes could use a good bash guard.
I'd post this in the Weight Weenies Forum if you want to get an opinion from people who obsess over these things.
Not that obsessing over weight is a bad thing, but they can probably give you some really good advice making the conversion.
1995 Trek 970 - 80mm Atom Race
1992 Serotta T-Max - 70mm Z3 Light
1993 GT All Terra - 46mm Mag 21 (STOLEN)
Something else to consider is that the advertised weight of parts don't always translate to real world weights.
Often crankset weights are lacking full disclosure of what parts are included in the weight measurement also year to year the change and the internet specs are not always accurate.
My XT and Saint cranks advertize a similar weight but in reality the gap is much more and it's noticeable with all the parts combined.
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