I run a 25mm gatorskin in training on a HED JET+ 9.

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I went downstairs and tried putting a Force 25 on with the speed fin. It rubs on the sides of the fin when you are trying to get it into the frame. I wasn't curious enough to really try finishing the install because I was going to have to adjust the brakes as well. It would be a bit of a pain to swap wheels, but you can probably just get it in there. No Speed Fin. No problem.

Now you could always let some air out, but I really question whether it is worth the hassle and there is zero chance I want to deal with that hassle on the side of the road. I would bet the SS23, GPTT23 and TLR 23 all fit much easier, have lower Crr than the Force, and are more aero. The Force 25 looks like a lollipop on the Jet +.

i run 25mm gp4k and gptt on my sc7.5 with wide rims (enve 7.8) - no problems, speed fin in place

I run 25mm GP TT as well with a Flo 90 and speed fin with no issues also.

I am not to worried about it looking like a lollipop or not as it is so shielded by the rest of the frame and am more worried about the Crr at this point. I wasn't going to be using a GP Force anyways. Thank you for checking that helps me a lot!

Awesome! thank you for the input.

Thank you! Glad to know that there are different setups that will work as well.

have the exact same set up as you. 23 GP4k2 work great. specialized turbo 24 fit also. GP4k2 in 25 would hit the fin, it was still very "rideable" with the 25, but it did scrape the fin.