Wide road rims - pressure?
Discussion
Here's my current pressures for two wheelset/tyre combos:
(1) Normal width (Fulcrum Racing 5) with 23mm tyres = 95/105 PSI Front/Rear
(2) Normal width (Ksyrium) with 25 mm tyres = 80/90
These seems to suit my weight (63kg) and the types of road surface I ride on. The 23mm tyres could probably be dropped a tad but I'm nervous about pinch flats.
I've just bought some wide rims (17mm internal, 25mm brake track) to be used with 25mm tyres. I rode them today at 80/90 and they felt pretty harsh over rougher roads. Some of this could be the wheels themselves but it felt like the pressure was causing them to be a bit skittish over rougher roads. Is there a rule of thumb for pressures on wide rims and wide tyres? Seems like I need to go lower to get the comfort level right but would say 75/85 be too low and risk flats?
(1) Normal width (Fulcrum Racing 5) with 23mm tyres = 95/105 PSI Front/Rear
(2) Normal width (Ksyrium) with 25 mm tyres = 80/90
These seems to suit my weight (63kg) and the types of road surface I ride on. The 23mm tyres could probably be dropped a tad but I'm nervous about pinch flats.
I've just bought some wide rims (17mm internal, 25mm brake track) to be used with 25mm tyres. I rode them today at 80/90 and they felt pretty harsh over rougher roads. Some of this could be the wheels themselves but it felt like the pressure was causing them to be a bit skittish over rougher roads. Is there a rule of thumb for pressures on wide rims and wide tyres? Seems like I need to go lower to get the comfort level right but would say 75/85 be too low and risk flats?
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