Oh those, ya, don't think you will be needing the 2.7 on those anyway. What I have heard is the 2.3s feel like the 2.5 on the optional roll bar mount. The 2.5s feel like 2.7s. So the 2.7 would probably "feel" like a 3.0 bar or maybe a 2.9. I haven't tried it myself and think they look a little too bulky, nice idea though. I guess if you had to try the 2.7, a little drilling would make it fit.