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Today’s Deals2025 YT Industries
Jeffsy MX UNCAGED 13
A 29″ / 27.5″ aluminum frame full suspension trail bike with high-end components.
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Manufacturer Price
$3,699| Weight | 34.2 lbs |
|---|---|
| Frame | Aluminum |
| Suspension | Full, 145 / 150mm |
| Fork | Marzocchi Bomber Z1 |
| Shock | Marzocchi Bomber |
| Wheels | 29″ / 27.5″ Aluminum |
| Drivetrain | 1 × 12 |
| Groupset | GX Eagle |
| Brakes | SRAM G2 Ultimate 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
Calling these bikes “all-new” might be a stretch, but there's no denying the incredible value and versatility.
Sep 2024
The YT Jeffsy Core 4 has excelled at being an all-round “grab and go” bike, regardless of what gets thrown in its way. Check out our review.
Aug 2024 · Cory Benson
YT’s newest limited edition Uncaged 14 build decks out their latest Jeffsy carbon trail bike with a killer paint job, a drool-worthy build, the first…
Jul 2024
The YT Jeffsy Mk3 Core 4 is a capable all-mountain bike which, thanks to its spec, has a bias towards descending but is equally able to climb. While the spec is hard to argue with and the value for money is excellent, it's worth paying attention to the frame sizing and geometry to get the ride you want. The bike could be improved further with a longer dropper post and a slacker head angle but YT has done a good job continuing to polish the already excellent Jeffsy.
May 2024 · YT Industries
Now, YT Industries takes it back to the 90s with a limited, retro-inspired Uncaged 13 edition, mixing things up with an MX-specific frame and custom, nostalgic silver components..
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 · Robin Weaver
The new Mk III Jeffsy feels more capable but just as much fun as ever
Well-balanced geometry
Suspension feels active but supportive
Very capable on the terrain I tested it on
Freewheel pickup could be quicker
Front tyre not the best in soft mud
| Fork | MARZOCCHI BOMBER Z1 Travel: 150mm Spring Type: Air |
|---|---|
| Shock | MARZOCCHI BOMBER AIR Travel: 145mm |
| Bottom Bracket | SRAM DUB BSA |
| Headset | CANE CREEK SERIES 40 |
| Stem | RENTHAL APEX 35 |
| Handlebar | RENTHAL FATBAR 35 |
| Saddle | SDG BEL AIR 3.0 |
| Seatpost | YT POSTMAN V2 Type: Dropper |
| Grips | ODI VANS V2.1 |
| Rear Derailleur | SRAM GX EAGLE |
|---|---|
| Crank | SRAM GX EAGLE |
| Shifters | SRAM GX EAGLE |
| Cassette | SRAM GX EAGLE |
| Brakes | SRAM G2 ULTIMATE Type: SRAM G2 Ultimate Hydraulic Disc |
| Rims | CRANKBROTHERS SYNTHESIS ENDURO 2 ALLOY - SILVER OE |
|---|---|
| Tires | FRONT: MAXXIS DHF I REAR: MAXXIS MINION DHR II |
First added February 25
Last updated May 24
Not listed for 379 days