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Simple - you're static on the rollers.
One thing you forget is that you never stay in the exact same position for the entire 100 miles compare to riding the rollers inside your slightly askewed flat.
You might stand up on the saddle to climb the Col d'Wimbledon Hill, you wait at the traffic light sitting on your top tube like a prommuter in Kingston, you shift back as you perform your splendid attack at Sawyer Hill to chase your fellow MAMIL on his orange Allez, or simply ride on the very nose of your saddle and arm tucked in, in a last ditch attempt at trying to stay under 1 hours during the notorious three laps challenge.
oh hai ..
why do i get numbness in the bollocks region only when I am on rollers and never ever on the road even after 100 miles or richmond 3 laps ? I have also noticed I put more weight on hands while on rollers .. are they constant downhill angle? Or is my flat?