2023 YT Industries
Jeffsy CORE 2 27
A 27.5″ aluminum frame full suspension enduro bike with high-end components.
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Manufacturer Price
$2,999| Weight | 33.7 lbs |
|---|---|
| Frame | Aluminum |
| Suspension | Full, 150 / 150mm |
| Fork | Fox Performance Float 36 |
| Shock | Fox Float X Performance |
| Wheels | 27.5″ Aluminum |
| Drivetrain | 1 × 12 |
| Groupset | NX Eagle, Truvativ Descendant |
| Brakes | Hydraulic Disc |
| Seatpost | Dropper |
For This Bike
Based on build material and quality level of the frame, fork, wheelset, groupset, suspension system, and more.
Compare the full Jeffsy model range
View Comparison5'0" – 5'6"
5'4" – 5'10"
5'8" – 6'1"
5'11" – 6'5"
6'3" – 6'8"
None yet.
Do you have this bike? Help other riders make a decision about which size will work for them by sharing your own size and fit notes.
Mar 2024 · Ben Haworth
The YT Jeffsy Core 4 is a bike that arrives in a box that is not quite perfect out of the box. BUT... there is loads of potential here.
Jan 2024 · Simon Kohler
How did the YT JEFFSY CORE 5 fare in our big 2024 trail bike group test?
Trail bike with fun guarantee
Mind-boggling price/performance ratio
Super intuitive handling
Pure agility!
Countless clever frame details
No storage compartment on the alloy model
Jan 2024 · Dario DiGiulio
The Jeffsy boasts easy, intuitive handling, and now has in-frame snack storage.
Intuitive and easy handling
Active, grippy suspension feel
Quality frame with well-executed storage and accessories
Requires attention in very rough terrain
Some may wish for more supportive suspension
Stock frame storage bags could be improved
Oct 2023 · Jamie Darlow
YT has reworked its Jeffsy trail bike, adding more tech, more price, and better performance
Pedals better when sat down and stood up cranking
Frame is sleeker and now comes with internal storage
Bikes range from £2,500 up to £5,999 for Core 5
Amazing spec on Core 5, with Fox Factory suspension
Costs a bomb for a direct-sales bike
Frame storage door could be bigger
Jun 2023 · Tom Marvin
A blast from the past that's still a serious contender
Fun, poppy ride quality
Excellent frame details
Good value for money
Some pedal bob when you’re trying hard
Harsh cockpit
Brakes are underwhelming
Apr 2023
The YT Jeffsy Primus 27 steps up an affordable 150mm all-mountain bike for riders 135cm to 165cm tall (or 4’5” – 5’5”); priced at $2,399
Feb 2023
Read our YT Industries Jeffsy Core 2 review and see why this versatile, affordable mountain bike is made for rippers and beginners alike. Read the review now!
Best Bang for the Buck
Solid Spec
Looks the Most Refined
Comfortable All-Day Ride
Shift Performance or lack thereof
G2 Brake Fade
Short Dropper Post
Aug 2022
The YT Jeffsy 29 Core 3 is a very capable all-mountain bike which can handle the rough stuff but is equally at home on flow trails and jumps. While the specification list is solid for the money, it's worth paying extra attention to frame sizing and geometry to get the ride you want. With a longer dropper and some tougher tyres this bike has what it takes to be a real challenger when it comes to the best mountain bikes.
| Fork | FOX 36 FLOAT PERFORMANCE, 29“ | 150 mm Travel | Grip | 110 x 15 mm Axle | 44 mm Offset Travel: 150mm Spring Type: Air |
|---|---|
| Shock | FOX FLOAT X PERFORMANCE, Shock Length: 230mm | Shock Stroke: 65 mm ≙ 150 mm Travel | 2-way Adjustable Low-Speed Compression, Adjustable Rebound and Air Pressure Travel: 150mm Spring Type: Air |
| Headset | ACROS AZX-576, ZS44 ZS56 | High Cap | 2 Spacer 5 mm |
| Stem | E13 Base 35, 50 mm | 0°Rise | 6061 AL | Black |
| Handlebar | E13 Base 35, Rise 35 mm | Width 780 mm | 9° Back Sweep | 5° Up Sweep |
| Saddle | SDG BEL AIR 3.0, 140 mm I Lux-Alloy Rail I YT Custom Design |
| Seatpost | YT POSTMAN Standard Remote , Ø 31.6mm | 125 mm (S-M) |150 mm (L) | 170 mm (XL-XXL) Type: Dropper |
| Grips | ODI ELITE MOTION V2.1, Lock-On |
| Rear Derailleur | SRAM NX EAGLE, 12-speed |
|---|---|
| Crank | SRAM Descendant 6k, Crank Arm Length 175 mm | 32T I DUB-PressFit |
| Shifters | SRAM NX EAGLE, 12-speed |
| Cassette | SRAM PG 1230 EAGLE, 11-50T | 12-speed |
| Brakes | SRAM G2 R, Rotor CENTERLINE Ø front 200 mm / rear 200 mm | Adjustable Reach Type: Hydraulic Disc |
| Rims | CRANKBROTHERS SYNTHESIS ALLOY, Front: Aluminum Rims 29“ | Inner Width 31,5 mm | Hub 110 x 15 mm | Rear: Aluminum Rims 29“ | Inner Width 29,5 mm | Hub 148 x 12 mm | Freehub HG |
|---|---|
| Tires | MAXXIS MINION DHR II, Tire Size 29“ x 2.4 | EXO Casing | Tubeless Ready | Dual Compound |
Last updated October 21
Not listed for 196 days