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The problem with the 29” Nokians is weight and tire volume/flotation.
The Nokians we’ve been riding on our old 26ers are Nokian Extreme 294 26x2.1”. They have 294 solid tungsten-carbide steel studs and a steel wire bead. They weigh 895 grams.
Nokian’s 29er tire is the Nokian Gazza Extreme 294 29x2.1. Same number of solid tungsten-carbide steel studs spread over the larger 29” area. Steel wire bead, not tubeless ready (though I read a comment from someone running them tubeless). They weigh 1100 grams each.
Ice Spiker Pro 29 x 2.25” has 402 studs with tungsten-carbide cores surrounded by aluminum to save weight and a Kevlar, folding, tubeless-ready bead, which also saves weight. 890 grams.
In addition to the weight savings, the Ice Spiker Pros are 2.25” wide, so they float better than the Nokians - we’ve seen the advantage fatties provide...
http://forums.mtbr.com/29er-components/29er-studded-tires-770085.html
Read the reviews and you will see several people who switched from 2.1” Nokians to the 2.25” Schwalbes, and they all say there is a big improvement in flotation and speed!
FYI, Nokian does make an Aluminum-clad, tungsten-carbide stud, folding Kevlar bead tire, the Nokian Hakka WXC300 26x2.1” which weighs 695 grams. But there is no 29” model.
Remember to break them in to avoid stud loss while riding rocky terrain. Norm did a proper break-in and only lost a few studs on our snow-free Vietnam ride, which was impressive considering how much bare rock we rode!!
Break-in = 30-40km on asphalt with low enough pressure to allow the edge studs to touch the ground. I.e., like 20 PSI.
bg