What size alternator belt for '97/98 1100gs

[Uncle-Fester]

As per title, I see two sizes on Motorworks site, one at 595mm and the other at 611mm, so which one will fit my 97/98 1100?

 

[NeilDD]

Use the 611, it allows for fitting the GSA tank later

There's more than enough movement in the slots for the 611

 

[Uncle-Fester]

Thanks, although I'll not be fitting the GSA tank anytime soon