IGH Versus Derailleur System Weight.
- I have long heard criticism of IGH systems as being a lot heavier than an equivalent derailleur system. Using Shimano annd Harris cyclery listed weights for the components on the Big Dummy I added things up. I substituted the XTR shifters weight for the SLX shifters on the Big Dummy as Shimano only lists XTR shifters weight that I could find. I would expect the SLX shifters to be heavier. For the removed two chain rings I used generic weights for the same BCD rings with the same number of teeth.
Derailleur system parts weight was 1437 grams.
The Alfine hub weight is 1680 grams supposedly. The difference is 243 grams or just over 1/2 pound. Add the weight of the Alfine shifter of choice and the difference will still be a lot less than 1 pound. The derailleur components weight to IGH weight did not include the removal of the front derailleur cable or the weight reduction due to usually the IGH using a shorter chain. These would slightly decrease the weight difference.
Overall the weight difference is minor enough IMO so that only a dedicated weight weenie would be worried about it. Of course the difference would be greater if replacing ultra light road components with an IGH but still well under 2 pounds I would expect.