Originally Posted by
alfeng .
FWIW. IMO, changing your bike's Shimano components will have negligible impact at this point in time compared with fitting a pair of TT handlebars on your bike + appropriate bar end shifters.
- MY observation is that the difference in Shimano front derailleurs is mostly in the quality of the clamp -- a steel "band" on the least expensive & a nicely anodized, cast aluminum clamp on the more expensive front derailleurs ... the difference in the front derailleur's cage design is often minimal or non-existent
[*] the difference on the rear derailleurs is a little greater, but
there is heavy trickle-down so that most of the less expensive Shimano rear derailleurs are almost as good as the most expensive Shimano rear derailleurs...
- beyond the pulley wheels on the more expensive Shimano rear derailleurs having bearings instead of bushings (and, I'm not sure there is a true advantage if they are not properly maintained)
- most of the difference is in materials & therefore weight
- only the least expensive Shimano rear derailleurs which are found on Department Store bikes will be worth changing sooner-rather-than-later, but if those are properly maintaned & adjusted they are probably just fine (except for their boat-anchor weight) for the intended riders
After the TT bars, the rider's clothing can apparently make a difference ...
More aerodynamic wheels can make a difference, but are not advised for windy days.
- if the hubs on your wheels have LOOSE BEARINGS, then learn how to service them AND re-grease them with something like SLICK HONEY or even transmission oil for races ... be sure that you lock the cones properly so that they don't tighten-and-bind!!
- if you choose to use a lighter weight grease, then re-grease OFTEN (before every race/ride)
[*] the
quality of the cartridge bearings CAN make a difference, too ...
FYI. DT/Swiss hubs have exceptionally smooth bearings ...
- unfortunately, DT/Swiss hubs should not be serviced by your LBS unless you are sure of the quality of bearings they are using (i.e., they should probably be sent back to DT's service center for service)
- you can fit better cartridge bearings than the ones which are in a plebeian cartridge bearing hub when it came from the factory