First Look | The 2024 YT Bkes Jeffsy gets updated frame with STASH downtube storage

An overview of the 2024 YT Jeffsy

The YT Jeffsy sits in between the Izzo (the 130mm travel lightweight trail bike), and the Capra (the 170mm travel enduro bike). Splitting the difference, the Jeffsy aims to be a versatile all-rounder. It’s equipped with a 150mm travel fork, 145mm of rear travel and 29in wheels, putting it into direct competition with fellow All Mountain bikes such as the Trek Fuel EX, Focus JAM and Specialized Stumpjumper EVO.

For 2024 the Jeffsy has received an all-new frame that’s available in carbon and alloy variants. Both utilise an updated V4L suspension design that boasts improved pedalling performance and big-hit support compared to the previous model.

The big news with the carbon frame is the arrival of the integrated STASH downtube storage. Unlike Trek and Specialized, YT has positioned the entry hatch separately to the bottle cage with the aim of minimising vibration and noise. The hatch features a double-sealed lip to prevent water ingress into the frame, and a soft neoprene pouch is included for housing tools and spares.

The Jeffsy frame also features bolt-on downtube protection, a top tube accessory mount, and clearance under the shock to fit YT’s own 620ml Thirstmaster bottle and side-entry cage.

Geometry & sizing

The geometry has also received a massage on the 2024 YT Jeffsy, with the head angle slackening out by a full degree to 65°. It also features size-specific seat angles, that get steeper as you go up the size range in order to prevent taller riders from feeling like they’re right over the back wheel.

As with the previous model, the new Jeffsy features a two-position flip chip in the lower shock mount. Flipping this into the High position will lift the BB height by 8mm and steepen the angles by 0.6°.

Compared to the old frame the reach is 5mm longer, and so too are the chainstays. Combined with the slacker head angle, the overall wheelbase has grown by quite a bit. On a Large frame size for example, the wheelbase is 20mm longer on the new Jeffsy.

YT Jeffsy price & specs

There are five models in the 2024 YT Jeffsy lineup, two of which use an alloy frame and three of which use carbon frames.

All models come with a Fox 36 or RockShox Lyrik up front, 4-piston brakes and 200mm rotors, a YT Postman V2 dropper post and Maxxis Minion tyres with EXO+ casings.

We’re still waiting to confirm Aussie pricing and availability, and will update this article once as soon as we get the relevant info. In the meantime, read on for the detailed specs for the 2024 YT Jeffsy model lineup.

2024 YT Jeffsy Core 5

• Frame | Ultra Modulus Carbon, V4L Suspension Design, 145mm Travel
• Fork | Fox 36 Factory Series, GRIP2 Damper, 44mm Offset, 150mm Travel
• Shock | Fox Float X Factory Series, 210x55mm
• Wheels | Industry Nine 1/1 Hubs & Crank Brothers Synthesis Enduro Alloy Rims, Inner Width: 31.5mm Front & 29.5mm Rear
• Tyres | Maxxis Minion DHF EXO+ 3C Maxx Terra 2.5in Front & Minion DHR II EXO+ 3C Maxx Terra 2.4in Rear
• Drivetrain | SRAM X0 Eagle AXS Transmission 1×12 w/32T Crankset & 10-52T Cassette
• Brakes | SRAM Code RSC 4-Piston w/200mm HS2 Rotors
• Bar | Renthal Fatbar 35, 30mm Rise, 780mm Width
• Stem | Renthal Apex 35, 50mm Length
• Seatpost | YT Postman V2, 31.6mm Diameter, Travel: 125mm (S), 150mm (M), 170mm (L), 200mm (XL), 230mm (XXL)
• Claimed Weight | 14.8kg
• RRP | $TBC

2024 YT Jeffsy Core 4

• Frame | High Modulus Carbon, V4L Suspension Design, 145mm Travel
• Fork | RockShox Lyrik Ulimate, Charger 3 Damper, 44mm Offset, 150mm Travel
• Shock | RockShox Super Deluxe Ultimate, 210x55mm
• Wheels | Crank Brothers Synthesis Enduro, Alloy Rims, Inner Width: 31.5mm Front & 29.5mm Rear
• Tyres | Maxxis Minion DHF EXO+ 3C Maxx Terra 2.5in Front & Minion DHR II EXO+ 3C Maxx Terra 2.4in Rear
• Drivetrain | SRAM GX Eagle Transmission 1×12 w/32T Crankset & 10-52T Cassette
• Brakes | SRAM Code RSC 4-Piston w/200mm Centerline Rotors
• Bar | Renthal AL2014, 30mm Rise, 780mm Width
• Stem | Renthal Apex 35, 50mm Length
• Seatpost | YT Postman V2, 31.6mm Diameter, Travel: 125mm (S), 150mm (M), 170mm (L), 200mm (XL), 230mm (XXL)
• Claimed Weight | 15.1kg
• RRP | $TBC

2024 YT Jeffsy Core 3

• Frame | High Modulus Carbon, V4L Suspension Design, 145mm Travel
• Fork | Fox 36 Performance Series, GRIP Damper, 44mm Offset, 150mm Travel
• Shock | Fox Float X Performance Series, 210x55mm
• Wheels | DT Swiss M1900, Alloy Rims, 30mm Inner Width
• Tyres | Maxxis Minion DHF EXO+ 3C Maxx Terra 2.5in Front & Minion DHR II EXO+ 3C Maxx Terra 2.4in Rear
• Drivetrain | SRAM GX Eagle 1×12 w/32T Crankset & 10-52T Cassette
• Brakes | SRAM Code R 4-Piston w/200mm Centerline Rotors
• Bar | Renthal AL2014, 30mm Rise, 780mm Width
• Stem | Renthal AL6061, 50mm Length
• Seatpost | YT Postman V2, 31.6mm Diameter, Travel: 125mm (S), 150mm (M), 170mm (L), 200mm (XL), 230mm (XXL)
• Claimed Weight | 14.9kg
• RRP | $TBC

2024 YT Jeffsy Core 2

• Frame | Alloy, V4L Suspension Design, 145mm Travel
• Fork | Fox 36 Performance Series, GRIP Damper, 44mm Offset, 150mm Travel
• Shock | Fox Float X Performance Series, 210x55mm
• Wheels | DT Swiss M1900, Alloy Rims, 30mm Inner Width
• Tyres | Maxxis Minion DHF EXO+ 3C Maxx Terra 2.5in Front & Minion DHR II EXO+ 3C Maxx Terra 2.4in Rear
• Drivetrain | SRAM GX Eagle 1×12 w/32T Crankset & 10-52T Cassette
• Brakes | SRAM Code R 4-Piston w/200mm Centerline Rotors
• Bar | Renthal AL2014, 30mm Rise, 780mm Width
• Stem | Renthal AL6061, 50mm Length
• Seatpost | YT Postman V2, 31.6mm Diameter, Travel: 125mm (S), 150mm (M), 170mm (L), 200mm (XL), 230mm (XXL)
• Claimed Weight | 15.5kg
• RRP | $TBC

2024 YT Jeffsy Core 1

• Frame | Alloy, V4L Suspension Design, 145mm Travel
• Fork | RockShox Lyrik, Rush RC Damper, 44mm Offset, 150mm Travel
• Shock | RockShox Deluxe Select+, 210x55mm
• Wheels | SUNRinglé SR329 Trail Comp, Alloy Rims, 30mm Inner Width
• Tyres | Maxxis Minion DHF EXO+ 3C Maxx Terra 2.5in Front & Minion DHR II EXO+ 3C Maxx Terra 2.4in Rear
• Drivetrain | SRAM NX Eagle 1×12 w/32T Crankset & 11-50T Cassette
• Brakes | SRAM DB8 4-Piston w/200mm Centerline Rotors
• Bar | e*13 Base 35, 35mm Rise, 780mm Width
• Stem | e*13 Base 35, 50mm Length
• Seatpost | YT Postman V2, 31.6mm Diameter, Travel: 125mm (S), 150mm (M), 170mm (L), 200mm (XL), 230mm (XXL)
• Claimed Weight | 16kg
• RRP | $TBC

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