Is that chainset already on your bike? If you remove the BB, the numbers are probably on the cartridge that will tell you what the spindle length is on it currently. Or does your bike not have a cartridge and is still the old separate spindle, bearings and cups? In that case just measure.
I know in your second response you said you were going to replace or put in something else. But it wasn't clear to me what was going to be replaced or put.
Since you said chainset, can we assume you are from UK or somewhere that use that term? Here in the States, most use the term crankset. Some will argue you up and down that it's a crankset. I just think it's interesting like the differences in tire and tyre.
Last edited by Iride01; 03-28-24 at 12:14 PM.