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Just base it on the average speed you want to achieve (if you've not ridden the course find someone on stava that's got a similar time to yours on a course you've both ridden) plus your preferred cadence. Then add 4".
dbr-
Last 25 I did at 26mph, which was alright. 104" gives 28mph at 90rpm, but I don't know whether I'd sustain that or just be grinding away.
I saw @xavierdisley on 114" on the E2/25 but he's a bit more experienced than me.
tbc
I'm doing the H25/1 tomorrow.
Am I being stupid by thinking about gearing up for it? It looks relatively flat and fast and I've borrowed a 13t cog so I could go up to 104". I haven't had time to train on this gearing, but when I first geared up to 98" it was the same scenario and was a big improvement on some courses.
I got a 25 time I was really pleased with the other week and I don't necessarily expect to beat it again this year, but it is quite a long way to drive to experiment in a race.