1993 Explosif BB size

[Err]

Hi i was wondering if anyone could help me with the size of the bb on my 1993 explosif.

I'm running the original sugino xp cranks.

 

[Huntso]

68/107 I reckon

 

[Err]

Cheers.

 

[Anthony]

Hi i was wondering if anyone could help me with the size of the bb on my 1993 explosif.
I'm running the original sugino xp cranks.

I'm sure Rich must be correct, but one other way of telling is as follows:

1. take a cranks/bb combination that you know is right

2. mount the cranks onto the bb, not in a frame and with both cranks pointing in the same direction.

3. measure firstly the distance between the little ring and the centre of the bb and double it (having marked the centre in advance if necessary), and secondly the distance between the insides of the ends of the crank arms.

4. take the cranks in question and any random bb

5. repeat steps 2 and 3 above

6. the difference between the results in steps 3 and 5 (which should be roughly the same for both measures) is the same as the amount by which the random bb in step 4 differs from the ideal

 

[Huntso]

As ever Anthony explains it in great detail and wouldn't hesitate to check using his guidelines.

I'm pretty sure that its a 107 or at worst 110, sure either would be fine though.
To confuse matters Sugino made a 68/109 BB, so make of that what you will.

 

[Err]

It's a un-71 in there atm. I had it out but put it back in until i can get a new one, it's rough though. Foolishly didn't measure it whilst i had it out, i was rushing to get it rideable by the end of the night.