R600 compact is 105 level?
09-23-07, 06:35 PM
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R600 compact is 105 level?
I just got from PBK some R600 cranks (34/50T) to replace FC-5600 105 cranks (39/50T) on my wife's bike. Here are the weights:
Ultegra 39/53T: 745g
105 39/50T: 755g
R600 34/50T: 850g
The crank arms are labeled Hollowtech II, but they have a groove on the inside and are about 45g heavier on each side. The R600 rings have Ultegra-style step-up rivets so my guess is that shifting should improve (not that she'd really notice), but I'm really surprised at how big a weight difference that is. Nearly a quarter pound!
I've been thinking of getting R700 for my cross bike. Anyone know if it uses the same arms? (105 uses the same as Ultegra) One would think a compact would weigh a bit less given the smaller dimensions but that appears to not be the case.
edit: NM, I found the answer in this parallel thread. The R600 has solid arms, R700 has hollow. The good news for 105 users is that they get the same arms as Ultegra!
Ultegra 39/53T: 745g
105 39/50T: 755g
R600 34/50T: 850g
The crank arms are labeled Hollowtech II, but they have a groove on the inside and are about 45g heavier on each side. The R600 rings have Ultegra-style step-up rivets so my guess is that shifting should improve (not that she'd really notice), but I'm really surprised at how big a weight difference that is. Nearly a quarter pound!
I've been thinking of getting R700 for my cross bike. Anyone know if it uses the same arms? (105 uses the same as Ultegra) One would think a compact would weigh a bit less given the smaller dimensions but that appears to not be the case.
edit: NM, I found the answer in this parallel thread. The R600 has solid arms, R700 has hollow. The good news for 105 users is that they get the same arms as Ultegra!
Last edited by csown; 09-23-07 at 06:50 PM.
09-23-07, 07:43 PM
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my lbs just said the weight is the only real difference...i have the r600 and i have about about 3800 miles on it and it is perfect
