Question re New Ultegra Grey Groupset

cosmaboy

Hi,

I am in the process of buying new groupset but having some issues with the below sizes....

These are the options and to be honest i'm not too techie and do not have a clue which is the right one.

Any ideas?

170mm, 11-23, bsa 1.37, 52x39
170mm, 11-23, ita 36x24, 52x39
170mm, 11-25, bsa 1.37, 52x39
170mm, 11-25, ita 36x24, 52x39
170mm, 11-28, bsa 1.37, 52x39
170mm, 11-28, ita 36x24, 52x39
170mm, 12-23, bsa 1.37, 52x39
170mm, 12-23, ita 36x24, 52x39
170mm, 12-25, bsa 1.37, 52x39
170mm, 12-25, ita 36x24, 52x39
172,5mm, 11-23, bsa 1.37, 52x39
172,5mm, 11-23, ita 36x24, 52x39
172,5mm, 11-25, bsa 1.37, 52x39
172,5mm, 11-25, ita 36x24, 52x39
172,5mm, 11-28, bsa 1.37, 52x39
172,5mm, 11-28, ita 36x24, 52x39
172,5mm, 12-23, bsa 1.37, 52x39
172,5mm, 12-23, ita 36x24, 52x39
172,5mm, 12-25, bsa 1.37, 52x39
172,5mm, 12-25, ita 36x24, 52x39
175mm, 11-23, bsa 1.37, 52x39
175mm, 11-23, ita 36x24, 52x39
175mm, 11-25, bsa 1.37, 52x39
175mm, 11-25, ita 36x24, 52x39
175mm, 11-28, bsa 1.37, 52x39
175mm, 11-28, ita 36x24, 52x39
175mm, 12-23, bsa 1.37, 52x39
175mm, 12-23, ita 36x24, 52x39
175mm, 12-25, bsa 1.37, 52x39
175mm, 12-25, ita 36x24, 52x39

rpd_steve

Here goes...

on your last example of:
175mm, 12-25, ita 36x24, 52x39

-175mm is the crank arm length. 170 is 'short', 172.5 'medium' and 175 'long' - largely related to leg length and down to preference, shorter cranks feel smoother and more spiny and longer ones make you feel more powerful in some cases. 50% of people wouldn't tell the difference anyway.
-12-25 is the cassette size. 12-25 is a good all-rounder for moderate hills and good ability, 12-23 is very limited for hills and only really for the flats, TT and strong riders and 12-28 will give you a good bit extra on steep hills.
-ita OR BSA denotes either an Italian or British standard thread for the bottom bracket. Most are British, obviously Italian frames use Italian - but have your shop check. the number after just describes the threads again.
-52x39 is the teeth on the chain set. 52x39 is a 'standard double', and 50x34 is a 'compact'. a standard does restrict some up hills. A compact is a great all rounder for most, but may not be of benefit if you dont go near hills.

Hope it helps!

cosmaboy

Thanks Steve,

That's exactly the reply I was looking for.

Many thanks.
Mat