The tire is labeled at a 26×4.00 and it measures a true 4.0 inches from the farthest outside points, which is edge lug to edge lug (on a Holy Rolling Darryl at 10 PSI). For comparison, the Hüsker Düs that I was previously running (also a claimed 26×4.0 tire) measures only 3.78” from the widest point, which are the sidewalls.
The tread on the mammoth is very reminiscent of the 45NRTH – Dillinger and the newest Vee – Mission Command tires that we have ridden and tested. Our two test tires weighed 1290 g and 1292 grams each. The bead to bead measured 222 mm with the tread to tread measuring 111 mm. with the tire splayed out on a flat surface. When I mounted the tires onto a set of Surly Marge Lite rims the Mammoths plumped up to 95 mm wide.
Bethany really liked these tires! She shared that they felt really fast and that there was zero self-steer. She felt like there was a good balance between the fast rolling feel of the Mammoths and the amount of control that they added to her 9:Zero:7. The three words that Bethany chose to describe the way that the Mammoths performed was Fast – Control & Fun (all good things!). Probably the best sign that these tires are going to work out very well is the fact that Bethany told me that she wants to conduct a long term test on them. She basically told me that I’m not getting the Mammoths back from her, any time soon. It looks like we’ll keep tabs on how these tires treat Bethany over the next few weeks of riding and report back to you a little bit further down the trail.