Thanks, I feel better now. Mine are all measuring 2.1 inches. I was looking in BSA Twins and Triples and the Haynes manual. After your reply I pulled out BSA Twin Restoration and as you say, he lists longer springs for RR, SR, and RGS. As all my heads are alloy, I expect they are all off these models. I've not seen any numbers, but here in the USA everyone seems to think they need bigger bikes and more power than they can actually use. I expect the high performance models far outsold the A7 and Golden Flash.