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PostPosted: Wed Jan 25, 2012 8:03 pm 
Dirt Disciple
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Joined: Mon Jan 02, 2012 8:11 pm
Posts: 48
Location: South east
Hi all I need the size of the bottom bracket for this specialized hardrock.

Many thanks in advance

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PostPosted: Wed Jan 25, 2012 8:28 pm 
Old School Hero

Joined: Wed Dec 14, 2011 9:57 am
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How do you mean? Whether it's a 68mm or 73mm shell or something else?


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PostPosted: Wed Jan 25, 2012 8:40 pm 
Dirt Disciple
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Joined: Mon Jan 02, 2012 8:11 pm
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Location: South east
If I were to buy a replacement from crc. What size should I buy


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PostPosted: Wed Jan 25, 2012 9:05 pm 
Old School Hero

Joined: Wed Dec 14, 2011 9:57 am
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Not sure if anyone could tell you unless they have the same frame with the same cranks. I can tell you how to measure it though.

If the bottom bracket is a square taper or similar sealed unit (Octalink, Powerspline, etc) and you can get the old one out (I'm guessing you can if you're replacing it), just take the old one out it will most likely have the two sizes you need written on it - most do. If not, take it out and measure the BB shell on the frame (this will be 68mm or 73mm) and the spindle length (end to end).

If they're through axle type cranks (two piece type things), you need to buy the BB that matches your cranks. You don't need a spindle length measurement but you do need a BB shell measurement to space it right (the BB will come with spacers).


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PostPosted: Wed Jan 25, 2012 9:06 pm 
Dirt Disciple
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Location: South east
hirosawa wrote:
Not sure if anyone could tell you unless they have the same frame with the same cranks. I can tell you how to measure it though.

If the bottom bracket is a square taper or similar sealed unit (Octalink, Powerspline, etc) and you can get the old one out (I'm guessing you can if you're replacing it), just take the old one out it will most likely have the two sizes you need written on it - most do. If not, take it out and measure the BB shell on the frame (this will be 68mm or 73mm) and the spindle length (end to end).

If they're through axle type cranks (two piece type things), you need to buy the BB that matches your cranks, you don't need a spindle length measurement but you do need a BB shell measurement to space it right (the BB will come with spacers).


Probably should have thought of that myself. I believe it's a sealed square taper unit. So hopefully it's written on there. Thanks very much!


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PostPosted: Thu Jan 26, 2012 11:54 pm 
Gold Trader / MacRetro rider
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Location: Sunny Glasgow
What cranks are they? maybe someone knows off hand what the axle size is supposed to be :?


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PostPosted: Fri Jan 27, 2012 4:31 pm 
Dirt Disciple
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Joined: Mon Jan 02, 2012 8:11 pm
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Location: South east
I honestly have no idea, looking at them... The cheapest that specialized could get their hands on at the time. Lol, bought some cheap flat bars today and some lock on grips. Would put the pics up but I doubt people are interested


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PostPosted: Sat Jan 28, 2012 10:32 pm 
Gold Trader
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Location: Gorleston-on-sea (If there is a bright center to the universe this is place furthest from it
99% sure it will be a 73mm shell same as my 97 Rockhopper FS, length depends on chainset that you are fitting :wink:


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