The bottom bracket on my Rockrider 5.0 has a little too much play in it so I figured it best to change it before I get a failure whilst I'm commuting. Does anyone know which bottom bracket I would need for it? Or advise on how I can find out? Also any ideas on what type of extraction/fitting tool I may need for this type of bottom bracket? Thanks in advanced

  • 1
    Looks like a relatively cheap bike, so its almost surely square taper which can be removed with a Park Tool BBT-32. Then, you can take out the old one and measure it to see what kind of BB length and what not you need.
    – Batman
    May 25, 2015 at 17:12
  • @Batman thanks for that. Gives me a good place to start.
    – Rich
    May 25, 2015 at 20:58

1 Answer 1


I can't precisely tell you which one you need with a picture, and I didn't find a good one in the internet. The bottom bracket you need is either an OctaLink or a Square bottom bracket. You should be able to figure out just by looking at your bike.

Before buying you need to check both the shell and the spindle lengths, as you can see here.

It is really easy to remove and install a new one, but you will need to buy a crank extractor and a bottom bracket removal tool. These aren't tools you will use very much so just get the cheapest ones you can find. You will also need generic tools to unscrew the crank, but you can figure these ones out.

You can find detailed instructions on how to do this here, or just search for a youtube video. Before installing the new one grease the hell out of those threads so it won't be a pain to remove next time, and because that part is very exposed to the elements. Stupid elements!

  • thanks for your answer.For those with the same bike, It was a square tapered bottom bracket size 127x68 mm although the bike comes in various sizes so the bottom bracket may vary, I suggest you extract and measure. Bottom bracket tool and crank extractor were both needed and cost a pittance on ebay. It is indeed an easy job.
    – Rich
    Aug 26, 2015 at 14:57

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