Same boat here. Switching to 15"s from 13"s as allowed by the rules now. My thought was the same as Andy and Greg's. It doesn't make sense to keep the 13"s around to "practice" on. Just going from 225/50 to 225/45 changes the shift points in my car, so I suspect the change will be much larger with the bigger rims.
BUT -- I do plan on keeping the 13"s for this reason -- cheap gearing. For CMP, a twight twisy track, the 13"s are perfect. At VIR and Lowe's, I run out of gear, so I need the 15s.
Since you now can run 13s and 14s, if you have any gearing issues you can "solve" them cheaply via this route.
NC Region
1980 ITS Triumph TR8
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