PSI on 700c studded tyres--how low can you go?
Tried out my new 700 x 37/40 Suomi IceSpeeds yesterday. The tires have a 49-72 psi range marked on the sidewalls. Using the rough guide suggested by Peter White Cycles, I pumped them up to 55 psi before setting out on my Trek 750 hybrid.
Ride quality didn't feel soft during a short stud-seating run on 60% wet pavement/40% brown snow and ice. Temperature was about 30 degrees F and traction seemed pretty good. Later, on an inch of fresh powder with the temperature dropping, the ride felt harder and I couldn't get any kind of consistent traction on city streets.
Anyone here have experience with these tires? I'd like to try pressures below the 49 psi minimum to get around better. I'm using the 750 as an urban all-rounder, which includes winter grocery runs, so occasional heavy loads need to be taken into consideration. The streets I'm riding on are rarely snow and ice free.