The new YT Jeffsy Base costs less but gives you a whole lot more

Updated geometry inspired by its carbon sibling and solid components list for under £2,000

Pack shot of full suspension aluminium mountain bike from YT Industries

YT’s Jeffsy Base is, as the name might suggest, the entry-level bike in the company’s Jeffsy trail range.

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The aluminium-framed Jeffsy Base uses trickle-down geometry and aesthetics from the most recent carbon Jeffsy bike, which was launched in 2019.

YT hinted heavily at the addition of an updated aluminium option to the range when the brand recently revealed its 2020 range, so it comes as little surprise to see the Base model brought up-to-date.

There are some significant changes to the new aluminium Jeffsy compared to the previous version: front suspension travel increases by 10mm (totalling 150mm for the 29er, 160mm if you opt for 27.5in wheels), it has a slacker head angle (66 or 65.5 degrees in the slackest setting for the 29er and 27.5in respectively), longer reach (470 or 462mm for a size L) and, amazingly, the already bargain price has also been cut by £100 to £1,999.

The Jeffsy remains YT’s 140mm rear suspension travel trail bike, but the changes to its geometry, YT says, give the rider a “comfortably aggressive position on the bike during technical descents”, while a steeper seat tube angle “allows great pedalling characteristics”.

RockShox Deluxe Select rear shock and linkage on full suspension YT Jeffsy
Geometry, aesthetics and technology have transferred from the 2019 carbon Jeffsy, including linkage and shock hardware access from the non-driveside.
YT Industries

In addition to the above changes, the frame linkage bolts and shock hardware have been made more easily accessible on the driveside of the bike, plus the bearings have been better sealed, according to YT. All this has, of course, been proved effective on the 2019 carbon Jeffsy, a bike we gave a four-star review.

Components on the new bike have been revised. The Jeffsy Base features a RockShox Yari RC fork and Deluxe Select rear shock, as well as a SRAM SX Eagle 1×12 drivetrain and SRAM Guide T Brakes. The DT Swiss M 1900 wheelset is known to be solid and it is shod with ever-reliable Maxxis Minion tyres. Finishing parts by RaceFace, SDG and YT make it a very enticing spec.

Finally, the new bike is available in two fresh colours: Twotone Blue or Black Magic. There are five size options from S to XXL and the components and pricing remain the same whether you choose 29in or 27.5in wheels.

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YT Jeffsy Base 2020 specification

  • Frame: YT Jeffsy AL
  • Sizes: S, M, L, XL, XXL
  • Wheel size: 29in or 27.5in
  • Fork: RockShox Yari RC
  • Shock: RockShox Deluxe Select
  • Headset: Acros AZX-576
  • Stem: Race Face Aeffect R 35
  • Handlebar: Race Face Aeffect R 35
  • Grips: ODI Elite Motion V2.1
  • Crankset: SRAM SX Eagle
  • Cassette: SRAM PG1210 Eagle
  • Rear derailleur: SRAM SX Eagle
  • Shifter: SRAM SX Eagle
  • Wheels: DT Swiss M 1900 spline
  • Tyres: Maxxis Minion DHR II
  • Brakes: SRAM Guide T
  • Seatpost: YT Postman
  • Saddle: SDG FLY MNT
  • Price: £1,999 / $2,299 / €2,299