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Today’s Deals2023 YT Industries
Jeffsy Primus 26
A 26″ aluminum frame mountain youth bike with upper mid-range components and sram g2 r hydraulic disc brakes.
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Manufacturer Price
$2,199| Weight | 30.9 lbs |
|---|---|
| Frame | Aluminum |
| Suspension | Full, 140 / 140mm |
| Fork | RockShox Reba |
| Shock | RockShox Deluxe Select |
| Wheels | 26″ Aluminum |
| Drivetrain | 1 × 12 |
| Groupset | SX Eagle |
| Brakes | SRAM G2 R 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 Comparison4'9" – 5'3"
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Summary
The YT Industries Jeffsy is a highly capable and versatile enduro bike, praised for its gravity-hungry nature, fast and confident riding, and exceptional value. It excels in both climbing and descending, with a suspension system that offers great traction and support. The bike is often compared to top models like the Santa Cruz Hightower and Canyon Spectral, standing out for its playful yet stable handling.
Incredibly capable and fun
Exceptional value
Modern geometry
Great suspension performance
Versatile for all-mountain riding
Pedal bob on long climbs
Limited water bottle space
Underpowered brakes on some models
Press-fit bottom bracket issues
Somewhat vague-feeling climbing characteristics
The YT Jeffsy turned our usual value conversation on its head.
BetaWith the YT Jeffsy Base 29, you get an incredibly capable bike at an exceptional value.
BIKE MagazineThe Jeffsy is an excellent jack of all-mountain trades.
Bike PerfectThis is about as close as you can get to the ‘one bike for all’ ideal for how a lot of modern mountain bikers ride.
BikerumorThe new Mk III Jeffsy feels more capable but just as much fun as ever
BikeRadarFeedback?
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Nov 2024 · Nelson
With a value spec of workhorse components, and putting higher-end components where it matters, this is a hard package to beat.
Top-notch paint quality and finish
Cleanly designed internal cable routing
V4L suspension design for great traction and efficient climbing
SRAM SX Eagle 12-speed with a broad gearing range
SRAM G2 R brakes with adjustable reach levers
YT Postman 100mm dropper seatpost enhances riding experience
Maxxis DHR II tires for excellent cornering and traction
Great value with workhorse components and higher-end components where it matters
SRAM SX Eagle drivetrain requires regular adjustment
760mm-wide aluminum handlebar too wide for most kids
Significant seal friction in forks and shocks for lighter riders
Stiff 35mm aluminum handlebar may exacerbate feedback and control issues
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
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.
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 · YT Industries
This is the next evolution of a proven formula, and with it, we go above and beyond in our pursuit of Trail Excellence..
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
Oct 2023
YT Industries has released the third generation of their do-it-all trail bike, the Jeffsy MK3. Check out our first ride impressions here.
Apr 2023 · Jessie-May Morgan
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
| Fork | ROCKSHOX REBA, 26“ | 140 mm Travel | 100 x 15 mm Axle | Offset 40 mm | Adjustable Rebound, Air Pressure Travel: 140mm Spring Type: Air |
|---|---|
| Shock | ROCKSHOX DELUXE SELECT, Shock Length: 190 mm | Shock Stroke: 45 mm ≙ 140 mm Travel | Adjustable Rebound, Air Pressure, Custom Tune Travel: 140mm |
| Headset | ACROS AZX-576, High Cap | 2 Spacer 5 mm |
| Stem | E13 BASE 35, Length 40 mm | 35 mm Clamp | Rise 0° | 6061 AL |
| Handlebar | E13 BASE 35, Width 760 mm | Rise 20 mm | 9° Back Sweep | 5° Up Sweep | 6061 AL |
| Saddle | SDG BEL AIR 3.0, YT Custom | Width 140 mm I Lux-Alloy Rail |
| Seatpost | YT POSTMAN V2, Ø 31.6 mm | Length 100 mm | Standard-Remote | Adjustable drop 20 / 10 / 5mm Type: Dropper |
| Grips | ODI ELITE MOTION V2.1, Lock On |
| Rear Derailleur | SRAM SX EAGLE, 12-speed |
|---|---|
| Crank | SRAM SX EAGLE, Crank Arm Length 165 mm | 30T | DUB |
| Shifters | SRAM SX EAGLE, 12-speed |
| Cassette | SRAM PG1210 Eagle, 11-50T | 12-speed |
| Brakes | SRAM G2 R, Rotor CENTERLINE Ø front 160 mm / rear 160 mm, Adjustable Reach Type: SRAM G2 R Hydraulic Disc |
| Rims | SUNRINGLÉ DUROC, Aluminum Rims 26“ | Inner Width 26 mm | Front Hub 100 x 15 mm, Rear Hub 148 x 12 mm |
|---|---|
| Tires | MAXXIS MINION DHR II, Front: Tire Size 26“ x 2.4 I EXO Casing I 3C MaxxTerra Compound I Tubeless Ready, Rear: Tire Size 26“ x 2.3 I EXO Casing I Dual Compound I Tubeless Ready |
First added April 27
Last updated July 13
Not listed for 694 days