New bottom bracket needed..

[snakey_75]

Hi guys, need some help/info with a new bb. First, the important bit, the bike is a Carrera Gryphon with caliper brakes, not disc. I have taken out the old bb and it is a Shimano UN72/115mm, from what I have found, this is an old model, don't know if this is the original. I have found UN55 bb's and these seem to be relatively common but don't know if these will fit. Does anyone know if the 55 will fit/does anyone know what the original one should be? Cheers for any help!!

 

[Milkfloat]

You simply need the UN55, but be careful and get the 115mm width.

 

[snakey_75]

@Milkfloat, cheers for the reply, thought it might be, seen things about different diameters and different threads so was just checking.