Hello,

Yesterday I rode 5 times around a 5 mile course and I timed myself on every lap except for the first lap. my lap times were:
1: not timed but probably the fastest
2: 19:16
3: 19:24
4: 19:28
5: 19:32
After the run I wasn't too exhausted I probably could of went 5 more laps and be under 21 min.
I have a Kilo TT PRO with 48 tooth chain ring and 16 tooth cog, according to my calculation I average about 15.45mph and about 64 rpm. So I question is those it seem like I am geared limited right now? If so what cog should I upgrade too?