Three millimeters seems insignificant, but to the growing number of 650B wheeled bicycle riding nerds like myself, 3mm is a big deal.
The Quest for a 38mm tire. This is considered the sweet spot for optimizing the handling of many French-style, bicycle frames (designed for carrying stacks of newspapers, bottles of wine, food, camping gear, or what have you, on a front rack, in panniers, or in a handlebar bag).
Yet there are very few 650B x 38mm tire choices. The Col de la Vie, which I have on my Ebisu, is marketed as being 38mm wide, but it’s really only about 35mm.
There’s also the Hetre, by Grand Bois, a new and beloved tire which is a full 42mm wide. Unfortunately, when properly fendered (with at least 8-10mm of clearance), not many frames can accommodate this width.
The Mitsubishi Trimlines pictured above once filled the hallowed 38mm niche, but they have been discontinued (I’ve been trying to locate a pair for 4 years). A replacement for the Trimline has been the Holy Grail of the 650B biking community for a number of years.
Finally, a replacement (or two). It seems there will be not just one, but perhaps two true 38mm tires to fill this void.
Three cheers for more wide tire choices!