Dirt Rag Magazine

Inside Line: First ride on the new GT Sanction enduro race bike

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When GT unveiled its Force and Sensor bikes last year they were a big hit with their sponsored athletes, but for the rigors of the DH-level Enduro World Series tracks, they knew they had to offer something to bridge the gap between the 150mm Force and 220mm Fury downhill bike. Enter the rebirth of the Sanction, this time as a 27.5, 165mm platform that is designed expressly for the “e-word.”

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Inside Line: First ride on the Lapierre Overvolt FS900 Bosch-powered e-bike

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If you don’t think e-bikes are a real mover in the bicycle marketplace? Look no further than the entry of Bosch in the marketplace to prove that some big brands are willing to invest serious resources in the growing market. For 2015 it has paired up with a few key brands to bring e-bikes with Bosch motors and control units—already a huge hit in Europe—to U.S. dealerships. Look for bikes from Haibike, Felt, and Lapierre, including this Overvolt FS900.

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NoTubes unveils new fat bike, disc road rims

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Last year we saw a prototype fat bike rim from Stan’s NoTubes, and while we figured a 26-inch wheel was in the works, today we saw the finished product: the Hugo is a 50mm-wide, tubeless rim with a unique cross section and options in all three wheel sizes.

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We also got the details and a ride in on the new Grail disc road wheel that is perfectly suited to all manner of “road” applications and slots in between the IronCross and Alpine models.
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Inside Line: Trek introduces new Fuel EX 27.5 with F1 derived Re:aktiv shock

Trek in North Carolina, June 2014.

Trek hasn’t shied away from developing proprietary suspension products in its search for better performance. About five years ago, the Dual Rate Control Valve (DRVC) air spring system appeared on Trek’s full suspension bikes, and has remained part of its suspension designs ever since.

About the same time, Trek started talks with Penske Racing Shocks through a fortunate father-son connection, the father being a well-respected NASCAR engineer, and the son being a frame engineer with Trek.

I knew the Penske name had something to do with racing, but I was mostly familiar with the big yellow rental trucks. Penske is a whole other ballgame supplying high-end, bespoke suspension solutions to the fastest motorsports racing teams in the business, including six of thirteen F1 teams.

There are a few mountain bikers on staff at Penske’s Reading, Pennsylvania, “skunk works” where most of the suspension design takes place. Those riders realized that the “regressive” damping design developed for F1 racing would have some application for mountain bikes, and a partnership with Trek would be a perfect vehicle to deliver it to the mountain bike market.

Find out how.


Kona’s Independent Suspension – An Overview

Suspension designs are a complicated thing. As Kona says, it’s a game of millimeters. From its first full-suspension model in 1995 to its coming 2015 models, Kona has refined its single-pivot, linkage driven suspension designs for their ultimate application. There are three variations in the current lineup, and this cool video walks you through the design philosophy of each.


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