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@gizmond
Just for informations sake, if you plan on going to the track, everyone* at the track works out GI based on 27" tubs, so if someone says put 88, that would be 49x15.
48x15, 86GI is a good place to start unless you have done a lot of road racing or something before.
(100GI will be no use unless you plan on stayer racing)