I have a MTB that I haven't been using from a while. Recently I thought of going for a ride but I remembered that it had something broken inside the BB ! So I was thinking what kind of BB it was ? And how could I repair it ? Actually it broke when I was riding my cycle very fast and suddenly the bottom bracket got undo you know...... Then I tried to tighten it temporarily tighten it So that I could take it to the mechanic afterwards. After some days I took it to him. He said something was broken inside and he would repair it. But after a few days it started to make noise then the pedals were not being straight while riding you know a bit wobbly and cross.. Then I left it for some days till now......

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Update: After I checked the datasheet or the manual of the Shimano derailleur it says best results with a BB-TY30 Then according to that it may have a bb-ty30. But after a bit of searching I found this picture that looks similar.......to mine. And I will source the real images as fast as possible.....

enter image description here

Here are the links LINK 1 LINK 2

  • You need better pictures to even tell what kind of crankset is on there. – Batman May 28 '17 at 14:05
  • Can't tell much from that lousy picture. It appears to be a 3-piece crank, but can't be sure. And there are a half-dozen different variations on 3-piece cranks. Probably 80% of recent units are simple cartridge units, but still can't guess what sort of end is on the crank -- whether square or one of the splined schemes. – Daniel R Hicks May 28 '17 at 18:02
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    I'm pretty sure that's a bicycle. If you want more specific info, you'll have to take some pictures of the BB. – Mike Baranczak May 28 '17 at 18:42
  • You can find better photos by googling the model name. The problem is, they are different, some seem to have cottered steel cranks and others some kind of three piece crank. – ojs May 28 '17 at 19:10
  • @ojs - Yeah, in some pictures that does look amazingly like a cottered crank, which is incredible for a bike presumably built in this century. – Daniel R Hicks May 28 '17 at 21:08

If those links are exactly your bike, then it looks like a MTB BSO with utterly standard components. 26" wheels with V brakes and a 7 speed freewheel on the back is nothing special.

Your other image shows and english threadded bottom bracket cartridge with square taper interface to the cranks. That will likely fit 2/3 of the MTB bikes and about 99% of the BSO grade MTBs.

The only other option is likely to be a cup-and-cone bearing bottom bracket, and we could tell that by looking at a photo of the bike's BB area, as requested already.

Neither of these two BB setups is weird or rare.

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