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madhouse
 
How much can I expect my average speed to drop when going from 700 x 25c slicks to 35mm Nokians? My bench mark speed is 18mph on my commute with the slicks.

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Mars
 
For me, about 3 mph. Of course all the other variables that affect winter riding speed, like air density, poor aerodynamics from bulky clothes, seasonal affective disorder and so forth play a role in further reducing speed. All I know that when I take off the studs in spring and put the slicks back on, I feel like I'm FLYING!!

clevernamehere
 
I'd have to say around 3mph (5kmph) speed reduction for me as well, all other factors being equal. With bulkier clothing & actually riding on ice/snow/slush my average speed was reduced by a total of 6mph(10kmph). I find my microfleece long underwear (sorry, I refuse to call them tights) slow me down quite a bit.

PaulH
 
Just mounting the front Nokian seems to produce zero drag increase, since, with my bike, most of the weight is on the rear wheel. Adding the rear Nokian does produce a drag increase that I notice -- particularly in the spring when they come off. Exactly what the speed decrease might be is uncertain, since I have a lot of stoplights on my route. Last March, I gained 5 minutes on a 30 minute ride first trip without them. That might have been just the excitement of springtime plus the luck of the lights.



Commutes can be a lot faster over ice and snow with them, of course -- both from being able to ride over shorter, but less-clear road segnents and from higher speeds.


Hard to quantify, but probably only a mile per hour or two on my routes.

Paul

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