I have had three or four of these because they were cheap, it turned out that in the long run it was cheaper to save up and buy a decent bottombracket. Everyone of these that I bought broke in under a month, the same two faults occured each time. 1) Mud and grit easily get past the seals and wear out the bearings causing them to cease or rattle. 2) The ends of the tapered arms round off very easily, even during light XC and commuting use I have rounded them off. Steer clear and buy a decent bottombracket, or even better get the new external type, or if your into jumping and DH get some 3piece cranks. ...
Advantages: Top of the range "bling" rear mech Disadvantages: 9 speed "only", superceeded by RD-7800 10-speed version
I bought this rear derailleur to replace an Ultegra mech when upgrading my bike from 8 to 9-speeds (well, 16 to 18 speed really with my double front chainset). Apparently, this mech is also compatible with 8-speed systems, you just need to change the cable mounting position.
DuraAce is the name of Shimano's top of the range group of bicycle components, or "groupset", for road race bikes, and the 9-speed 7700-series was introduced to the public in 1997 after Shimano sponsored riders using Dura-Ace 7700 series equipped bikes in 1996. Year by year, it's been enhanced, and this review is of rear mech from the 2004 model year.
For the non-bike-ophiles among you, the rear mech (or mechanism) is the device at the back end of the bike that moves the chain across the muliple cogs (cassette) on the back wheel to change gear - bigger cog ...
matt_fantastic 07.04.2006 (10.04.2006)
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Ciao members have rated this review on average: helpful Review of Shimano DuraAce
Advantages: Cheap, extremely durable, abuse tolerant Disadvantages: Poor crank choice, may not be suitble for extreme use
What's this?
It is a JIS square tapered BB. And in english...
BB - bottombracket. Screwed into the frame and serves as a mounting point for your cranks.
Square taper - Axle shaft of the bottombracket is tapered. The shaft is wider at the base than it is at the tip, so it ensures a very tight fit when the crank is tightened up. It fits square holed cranks only.
JIS - Japanese International Standard. This is a measure of the degree of taper. There is also the ISO standard used by European manufacturers, such as Campagnola. The vast majority of mountain bike cranks are JIS. An ISO crank may or may not fit a JIS square taper BB depending on the tolerances and amount of wear.
Evolution or Devolution?
In the last few years BB's have undergone something of a revolution. Octalink from Shimano, ISIS from ...
