Rated 5 out of 5 by Anonymous Works well for me in my snow commute
I needed a cheap 20" studded tyre for solely for commuting in the the short periods of snow we get in the UK. My Marathons plus could not provide me with enough traction last snow. Not so much choices in the 20" sizes but these were very cheap.
The model I received is the Kevlar version - there is apparently another version with just puncture protection which is a level down from kevlar according to Schwalbe. The tyre looks pretty cool in this size. Overall it is entry level and uses Schwalbes standard rubber compound. The sidewalls feel very thin and not much different in the grip area which doesn't inspire much confidence in puncture protection. I put in a tyre liner in my setup.
My bike is a BTwin Hoptown with 20" modified as a fixed gear. I can only comment on my experience on my snow commute and I doubt that I go any faster than 10-12mph in these conditions. For off roading, I would use my mountain bike and spend more on a better tyre.
I normally use Marathon Plus in 20 x 1.75 and although this Black Jack is 20 x 1.90 it is smaller than my marathons for some reason. This is good as I was concerned about clearance under the fenders.
My commute consists of 4 miles one way mostly of paths and some roads and these tyres performed very well in the snow, slush and ice. I run these at 30psi - another reason why I purchased this. The grip is soft so it goes over snow easily and quickly through snow but I imagine it wont last as long on bare tarmac. Acceleration feel is quicker than my Marathons but then it is half the weight. You can see and hear that the centre grip cuts through the snow/slush to the tarmac/pavement and as you ride through. Have not had any issues with traction through the pedals or grip loss yet (touch wood).
It is also pretty comfortable and quiet when you hit the tarmac. Very low note hum at the most. Quieter than my mountain bike tyres on tarmac anyway.
I probably would spend a bit more for the 26inch mountain bike size as I wouldn't go off roading on a bike with these 20" versions anyway and if you wanted something for a bmx, you would probably get something tougher. In this size probably make a cool looking tyre for a kids bike.
19 January 2013