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Today’s Deals2025 YT Industries
Jeffsy 29 CORE 2 CF
A 29″ carbon frame full suspension trail bike with upper mid-range components.
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Manufacturer Price
$4,199| Weight | 33.3 lbs |
|---|---|
| Frame | Carbon |
| Suspension | Full, 145 / 150mm |
| Fork | Fox Performance Float 36 |
| Shock | Fox Float X Performance |
| Wheels | 29″ Aluminum |
| Groupset | XT, SLX |
| Brakes | Hayes Dominion A4 Hydraulic Disc |
| Seatpost | Dropper |
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"
5'3" – 5'10"
5'7" – 6'1"
5'11" – 6'5"
6'2" – 6'8"
None yet.
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Summary
The YT Industries Jeffsy is a versatile mountain bike that excels in agility and suspension performance, offering a fun and reliable ride across various terrains. It stands out for its value, with high-quality specs and thoughtful frame details, though some may find its weight and component choices limiting. The bike's geometry and suspension are praised for their balance and capability in both climbing and descending.
Super fun to ride
Excellent suspension
Highly agile
Most affordable bike in the test
Exceptionally quiet ride
Spec could be improved
Heavier than some competitors
Shorter dropper post limits freedom of movement
The YT JEFFSY is the only bike in this test that has already proven itself in a previous comparison.
Enduro Mountainbike MagazineDespite the top-tier spec, the JEFFSY CORE 5 remains the most affordable bike in this test.
Enduro Mountainbike MagazineThe Jeffsy feels like the triumphant return of the real-value trail bike.
Mountain Bike ActionFeedback?
View all reviews
Apr 2025 · Ron Koch
Whether you’re a novice looking for a starter bike packed with value or a seasoned pro looking for a well-rounded, ride-most-anything machine, the Core 2 ticks all the boxes. With a sale price that’s less than $3k, it feels like an incredible deal that won’t last forever, too.
Feb 2025 · Steve Fisher
YT Industries reconfigures their JEFFSY CORE builds for 2025, now offering the mid-range bikes with carbon or aluminum frames.
Feb 2025
Calling these bikes “all-new” might be a stretch, but there's no denying the incredible value and versatility.
Feb 2025 · YT Industries
The Jeffsy range gets the Core treatment, with six options to suit most riders' needs.
Aug 2024 · Rich Owen
Rich Owen was a big fan of the previous Jeffsy, so what does he think of the latest Core 4 version after months of using it as his daily driver?
Excellent ride-anywhere bike
Updated frame with internal storage
Sorted component package with wireless SRAM T-Type drivetrain
Rides lighter than its actual weight
Useful internal and external on-bike storage
Matte black carbon finish is easily scratched and scuffed
Not the biggest internal storage opening
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.
Oct 2023 · Mike Hunger
With the 2024 JEFFSY, YT have unveiled the latest iteration of a true trail bike evergreen, which rolls into the new season with a fresh new look, and 5 different spec options. Here’s how it fared out on the trail.
Intuitive handling suits both beginners and advanced riders
Functional frame details
Top spec at a very fair price
No top-spec alloy variant
Cables aren’t clamped properly
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
| Fork | FOX 36 FLOAT PERFORMANCE Travel: 150mm Spring Type: Air |
|---|---|
| Shock | FOX FLOAT X PERFORMANCE Travel: 145mm |
| Bottom Bracket | SHIMANO BB-MT800-PA |
| Headset | CANE CREEK SERIES 10 |
| Stem | RACE FACE AEFFECT R 35 |
| Handlebar | YT HANDLEBAR |
| Saddle | SDG BEL AIR 3.0 OVERLAND |
| Seatpost | YT POSTMAN V2 Type: Dropper |
| Grips | ODI ELITE MOTION V2.1 |
| Rear Derailleur | SHIMANO SLX RD-M7100 |
|---|---|
| Crank | SHIMANO SLX FC-M7100 |
| Shifters | SHIMANO XT SL-M8100 |
| Cassette | SHIMANO SLX CS-M7100 |
| Brakes | HAYES DOMINION A4 Type: Hayes Dominion A4 Hydraulic Disc |
| Rims | DT SWISS M1900 |
|---|---|
| Tires | FRONT: MAXXIS DHF I HINTEN: MAXXIS MINION DHR II |
First added February 25
Last updated June 7