Released April 27

New 27.5" Jeffsy Primus from YT Industries

Photo Credit: YT Industries




Price Range



24″, 26″, 27.5″


Full, 130 / 130mm

Frame Material


Big on performance

The JEFFSY Primus was created with the smaller gravity seeker in mind, with size specific specifications chosen for maximum performance at the hands of young shredders. Originally available in 24” and 26” options the JEFFSY Primus now turns the dial to 27”, providing a direct path to getting sendy for riders ranging from 135 cm – 165cm (or 4’5” – 5’5”).

The highs and lows of this model family

Compare the Jeffsy Range
Spec Level
27.8 lbs30.9 lbs33.7 lbs
Manitou Machete JUNITRockShox RebaRockShox Lyrik
Wheel Size
NX, X1SX EagleSX Eagle
1 × 111 × 121 × 12
130mm rear, 130mm front140mm rear, 140mm front150mm rear, 150mm front
Where to Buy

At YT Industries


At YT Industries


At YT Industries

Spec Level

Based on build material and quality level of the frame, fork, wheelset, groupset, suspension system, and more.

YT Jeffsy Primus 27 is an Affordable All-Mtn Bike for Shorter Riders

Apr 27, 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

Read Review

From YT Industries


The smallest ride in the PRIMUS lineup still packs a punch with 130mm of travel all round. Suspension duties are performed by the Manitou Machete Junit fork and McLeod rear shock – both with custom light weight tunes as well as compression & rebound adjustment. Catering for smaller contact points, the junior specific SDG Slater bars, grips and SDG Fly seat provide improved ergonomics. As well as 155mm Sram X1 cranks, the drivetrain features SRAM NX 11 speed shifting and G2 R brakes with 160mm rotors. Sunringle Duroc 30 wheels keep things rolling with the cult classic Maxxis DHF & DHR II tire combo for increased confidence on the descents.


Next up the PRIMUS 26 comes in 140mm travel, this time with the Rockshox Reba fork and Deluxe Select rear shock (yep you guessed it- both have custom lightweight tunes). Steering this sender is an E13 base cockpit with ODI grips, and an SDG Bel Air 3.0 saddle rounding up the contact points. The PRIMUS 26 also gets a YT Postman 100mm dropper for little legs too. Drivetrain steps up to SRAM SX 12 speed derailleur with a 11-50T cassette and 165mm cranks, whilst wheels and tires are the slightly bigger version of it’s 24 stablemate. 


New to the PRIMUS platform, the PRIMUS 27 comes in hot with 150mm travel, capable of everything from all-mountain adventures to park bike sessions. Suspension is handled by the MY23 Rockshox Lyrik Base fork with Debonair+ air spring and Rush RC damper, and Deluxe Select rear shock with custom tune. Following on from the Primus 26” the E13 cockpit with ODI grips features here too, along with SRAM’s SX Eagle 12 speed drivetrain and 165mm cranks. Chosen for slightly longer legs, the 125mm YT Postman dropper and SDG Bel Air 3.0 provides seating duties, whilst the 27.5” Sunringle Duroc 35 wheels are wrapped in Maxxis DHF & DHR II tires for go-to grip in all conditions.