YT Jeffsy CF Pro first ride review
The big wheeler that promises even bigger riding
GBP £3,799.00 RRP | AUD $8,799.00 | USD $5,999.00 Skip to view dealsPublished:
A 29in wheel trail bike might not have been quite what everyone was expecting from the German company YT, a brand well renowned for its big-hitting, long-travel bikes. Will its first foray into the world of big wheelers create the same buzz as its now legendary Capra though?
- Best mountain bike: how to choose the right one for you
- 5 reasons why YT’s Jeffsy is the coolest 29er to own in 2016
YT Jeffsy CF Pro spec overview
- Frame: Jeffsy carbon 29″
- Shock: Fox Float DPS Factory
- Fork: Fox 34 Float
- Rear derailleur: SRAM X01
- Shifter: SRAMX01
- Cassette: SRAM XG 1175
- Chain: SRAM PCX1
- Brakes: SRAM Guide Ultimate
- Wheelset: DT Swiss XMC1200 Spline
- Front and rear tyre: Onza Ibex
- Stem: Renthal Apex
- Handlebar: Renthal Fatbar carbon black
- Saddle: SDG Circuit
YT Jeffsy CF Pro frame and equipment
YT wanted to ensure the Jeffsy fitted in with the rest of the bikes in its line-up, so designed it around a short stem and riser bar. The stumpy head tube also allows for the stem to be lifted/lowered on the steerer tube to help riders get bar height just where they want it.
The V4L suspension system pumps out 140mm of rear wheel travel, all of which is tamed using Fox’s Float DPS EVOL shock in a bid to deliver a supportive stroke that can be used to push hard and ride fast. There are two geometry settings that are easy enough to switch between thanks to the flip chip located in the rearmost shock mount, letting you slacken the head angle out from 68.9 to 67.6 degrees, which in turn drops the bottom bracket by 8mm.
YT Jeffsy CF Pro ride impression
YT hasn’t gone crazy with the geometry, with a reach of 425mm in size medium being a little on the conservative side compared to some of the competition. When seated, the 592mm effective top tube when paired with the 50mm Renthal stem let us tackle steep technical climbs without the front wheel lifting or wandering. This coupled with the fact that the Jeffsy weighs just 12.66kg (27.9lb) and has little in the way of energy sapping suspension bob means that, if you’re willing to put the effort in, this thing flies up hills.
YT Jeffsy CF Pro early verdict
The Jeffsy is one seriously capable all-rounder and is as happy munching miles as it is being razzed down technical singletrack.
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Product Specifications
Product
| Name | Jeffsy CF Pro |
| Brand | YT Industries |
| Available Sizes | S M L XL |
| Rear Shock | FOX FLOAT DPS FACTORY |
| Wheelbase (in) | 45.43 |
| Top Tube (in) | 23.31 |
| Seat Tube (in) | 17.32 |
| Chainstays (in) | 17.13 |
| Wheelset | DT SWISS XMC1200 SPLINE |
| Stem | RENTHAL APEX |
| Seatpost | ROCKSHOX REVERB STEALTH |
| Saddle | SDG CIRCUIT |
| Rear Tyre | ONZA IBEX |
| Rear Derailleur | SRAM X01 |
| Brakes | SRAM GUIDE ULTIMATE |
| Headset Type | ACROS AIX-326 |
| Handlebar | RENTHAL FATBAR CARBON BLACK |
| Grips/Tape | RACE FACE LOVE HANDLE |
| Front Tyre | ONZA IBEX |
| Frame Material | JEFFSY CARBON 29" |
| Fork Offset | 4.6 |
| Fork | FOX 34 FLOAT FACTORY |
| Cranks | RACE FACE NEXT SL |
| Chain | SRAM PCX1 |
| Cassette | SRAM XG 1175 |
| Frame size tested | M |
Authors
Rob Weaver is BikeRadar's technical editor-in-chief. Rob manages all of the testing here at BikeRadar and across our magazines, Mountain Biking UK and Cycling Plus. Rob first graced the pages of MBUK back in 2001 when working as a freelance writer and went on to start testing bikes for the title in 2007. In 2010 he joined the team full-time and has been keeping a close eye on all things test-related ever since. Rob’s expansive knowledge of bikes comes courtesy of his passion for racing. He cut his teeth racing cross-country mountain bikes in the early 90s before finding his feet in downhill. After many years competing on the UK national circuit (including a year attempting to race UCI DH World Cups), Rob realised his know-how and passion for bike setup, tech and writing clearly outweighed his racing ability. A degree in sports technology and decades of riding experience all help to give Rob a thorough understanding of what’s needed to create a great bike or product. While Rob’s a mountain biker at heart and never happier than when he’s sliding down a Welsh hillside, he’s more than happy to put the miles in on the road or gravel bike, too.
