Wednesday, September 8, 2010


Today I decided that I would tackle the bottom bracket fitting on the bike. Now I have to confess this is not entirely new territory for me as I have removed and replaced one before. Essentially, so long as you are careful and don't lose bits it is a slide out slide in job. However, you do need some specialist tools for the job one of which is a lockring spanner.

Bottom bracket shell, TT Gigapipe and TT chainset with chain retention device
The first job is to clean the gunk and paint from the inside of the bottom bracket shell. This is a simple job of toothbrush, white spirit and a cloth to clean up. I don't need to worry about losing some of the paint at the exit as a) its a cosmetic cover up and b) no one is going to see it behind the lockring tool.

Now the real reason for choosing a spare hour and a half to do this is to check out the fitting of the Gigapipe bottom bracket (BB). This is new to me as all my experience is with old square taper brackets. The first thing I notice is that the usual method of locking into place is probably not going to work here. I think I need another tool for the toolbox. I have a bottom bracket tool, but it doesn't look as if it is designed for this type of BB. Curse the world of non standard international design. Shimano are the market leaders, but they do what they like, at least everyone else tries to work from a standard. Although I suspect they wouldn't if they could get away with it. Anyway, it is a Shimano BB tool not an ISIS one. Plus I discover as I look in the tool box there is no lockring tool either. Now where did I put that? Ah Uncle Riotous has it in his garage!  Looks like this will have to wait until the tools are assembled in the same location.

So lesson, learnt I pack it all away again (Bottoms!). Time to drop a message to uncle about said tools. Not all wasted though as having looked at the set up I can see that it is really much easier than a cup and cone or square taper style BB. As an all in one there are no ball bearings or cartridges to chase around and apart from ensuring it is all greased and done up tight the job itself is as simple as pie.

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