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I am thinking of getting portals, I have to back down hills because no low gear on the 700. I put on 27" tires on the 700-4 deluxe Id like to keep 27" tires on 14" wheels will the 15% portals gear me lower than stock with the 27" tires? I do not mind giving up some speed since I put on the 27" tires it barley hit 40 mph anyways.