I just upgraded My 15 Trail EPS from stock 26 8×12 and 26 9×12 to 27 9×12 GBC Kanati Mongrels all the way around.

Fit…No issues at all fit well all the way around. No rubbing anywhere under antycircumstance (haven’t jumped it).

Appearance…Personally, I think it look great. Sits a little higher and I love the symmetry of having the same size all the way around.

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Performance…night and day would be an overstatement, however, extremely noticeable difference is probably accurate. I ran 10 psi all around (that’s what I had in stock). I ride hard pack, rocky, rutted, pa trails. I tested on my woods short course. It felt like it was on a rail. I think I could go 5-10 mph faster. Felt stuck. You can still get the back end to slide, but, much more controllably. I actually think I will run a little more psi, like 12-14. I could not detect and power loss with 27s. Additionally, any steering differences with 9 up front was an improvement.

Conclusion…tire did exactly what I wanted to. Improved appearance, better ride, better handling. As for durability…time will tell. It’s no mud tire, but I didn’t want one. I wanted tread on the ground and this tire does that!

Hope this helps someone with their tire decision.