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No helper problems. Would rather lose the saddle bottle but had no choice. Doubt the TT bag costs me much, if anything. Follows quite nicely from the stem so probably pretty neutral.
Overshoes are debatable. Wintunnel claims that Smart and the Pearl Izumi PVC coated ones are the only ones to test faster than a bare S Works shoes, and we can probably include Velotoze with that. But Velotoze are completely unbreathable and my feet were dripping after just a 50, Smart are £££ and the Pearl Izumi are so loose around my ankle that I think they'd be slower.
Have to factor in comfort for a 100.
That toptube bag and bottle make me think.
And no overshoes.
Overshoes would have got you under 4h!