YT Industries recently brought a Jeffsy fleet to Santa Cruz, California, and invited Mtbr to cast our verdict: love or hate. (If the former, then an #ILOVEJEFFSY social media post would be in order). Both Markus Flossmann (CEO) and Stefan Willared (CTO) were on hand to talk about the bike’s design, answer questions, and provide some colorful commentary about our riding while we tried to look good for the camera. Fortunately the location was our home base, so we got to ride Jeffsy on familiar territory. Continue reading to learn our final verdict on this new 140mm 29er trail bike.
We’ve already posted a first-look at the Jeffsy, which covers general information about the bike’s geometry, builds, and target use. So we’ll skip the rehash except to say that the Jeffsy is a bit less than I generally ride (29er with 160mm travel). Now on to on-trail performance of the Jeffsy Comp 1 (white bike), which is what we tested. The red frame rig in some of the photos is the CF Pro.
The Jeffsy looks quite similar to YT Industries’ other two bikes, the Capra and Tues, which is a very good thing. The main difference is the link now attaches to the seat tube instead of downtube. Additionally, the downtube takes a less direct path to the bottom bracket, which improves aesthetics and provides a location for a water bottle cage. Cables are routed both internally and externally, with the rear derailleur cable traveling inside the downtube and chainstay, dropper cable inside the seat tube, and other cables external, secured to the frame using integrated mounts with zip ties.
Cable management and routing, down and seat tubes (click to enlarge). Photos by Ale Di Lullo
Utilizing the 148mm boost rear hub standard has allowed frame’s designers to improve the chainline for these large wheeled trail machines and add additional stiffness, particularly useful with the larger wheel diameter. An additional 3mm on the drive side might not sound like much, but given the clearance, it makes a huge difference. Boost is only in the back though, with the front retaining 100mm hub spacing.
The bikes all look amazing, with the paint on the alloy version being particularly eye-catching (more of a flat look rather than glossy). Keeping the finish looking flawless is easier now, and there’s no more need for old inner tubes being wrapped around the stays. YT added not one, but three molded rubber protectors, located on the lower downtube and inside both the chainstay and seatstay.
Additional frame protection for chain drops was a stroke of genius. Metal pieces are located outside the cassette on the seatstay, on the front edge of the chainstay and on the upper portion of the bottom bracket — all the points of contact from chain drops. My personal bikes have scars in those areas, so I’m excited to see something functional to address it (that I didn’t hack together in the garage and have to worry about falling off and getting sucked into somewhere it shouldn’t be).