Hi Liza, sorry I haven't checked back here lately! I'm training for a team time trial! My team of 4 women has only practiced twice together, but we're planning to have fun! My size 40 sidis are a good fit with a bit of room at the toes. I think if I wore a 7.5 in street shoes, the 40 Sidis would be too short. In the past, I have just bitten the bullet and ordered a couple of pairs in the sizes I think I might wear, then sent back the ones that didn't. Once I even ordered 4 pair!(sent 3 back).If you send an e-mail link to a new team estrogen customer, they have a free shipping offer. You could call TE to confirm this. then the shoe shipping wouldn't be so painful! Good luck! Carol (who is no longer sellling the Sidis, but will try getting them shimmed, because they are comfy shoes)