Giant SCR 1.0

Bottom bracket difficulties

The bottom bracket on my Giant SCR 1.0 road bike is worn out, with lots of play on the drive side. My LBS had some difficulty locating the correct bottom bracket replacement, but this is it: Truvativ GXP BB English Thread retailing around £25.

Video: How to overhaul truvativ GXP

From the manufacturers

Truvativ GXP BB | SRAM

• Gutter Seal Technology
• Improved tool engagement
• Sealed cartridge bearings
• English or Italian threads

 

Ceramic - Ceramic bearings. Red Ano finish

Team - Custom steel bearings. Tungsten finish

XR - Custom steel bearings. Black finish

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Smashed Up Rear Mech

I've just managed to completely mangle the rear mech on my road bike. It's part of a Shimano 105 groupset, on a Giant bike and around a year and a half old.

This complete destruction occurred after the chain hopped off the front ring into the spider (happening quite frequently at the moment, despite my attempts to adjust the front mech). I tried changing down at the front to get the chain back on, but by then it had caught up in the spider and developed a double-loop (where the chain does two small full-circles on itself). In my lazy impatience I decided to carry on pedalling; as the knotted chain passed into the rear mech, the whole lot just exploded, and this is what the pictures show.

If you get a knotty chain, don't try to pedal it out!

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