Bike Comparison
    MSRP
    $1,999$2,199$2,399
    Where to Buy
    $1,599

    20% off At YT Industries

    $1,999

    9% off At YT Industries

    $1,999

    17% off At YT Industries

    Category
    Mountain YouthMountain YouthMountain Youth
    Weight
    27.8 lbs30.9 lbs33.7 lbs
    5.2
    5.0
    5.4
    AluminumAluminumAluminum
    Fork
    Manitou Machete JUNITRockShox RebaRockShox Lyrik
    Wheels
    AluminumAluminumAluminum
    24″26″27.5″
    Brakes
    Hydraulic DiscHydraulic DiscHydraulic Disc
    Groupset
    NX, X1SX EagleSX Eagle
    Drivetrain
    1 × 111 × 121 × 12
    Suspension
    FullFullFull
    Front Travel
    130mm140mm150mm
    Rear Travel
    130mm140mm150mm
    Brand Site

    us.yt-industries.com

    us.yt-industries.com

    us.yt-industries.com

    Summary
    The YT Industries Jeffsy Primus 24, YT Industries Jeffsy Primus 26, and YT Industries Jeffsy Primus 27 are all aluminum frame mountain youth bikes with hydraulic disc brakes. The Jeffsy Primus 24 has 24″ aluminum wheels and better components, the Jeffsy Primus 26 has 26″ aluminum wheels, and the Jeffsy Primus 27 has 27.5″ aluminum wheels, a better fork, more travel, and higher gearing.
    Similar Bikes
    Accessories
    Ride Feel

    Based on frame geometry and build specs.

    Handling
    nimblestable
    Jeffsy Primus 24
    Jeffsy Primus 26
    Jeffsy Primus 27
    Other Mountain Youth bikes
    Gear Range

    A bike with lower gearing will be easier to ride up steep hills, while a higher top end means it will pedal faster down hills.

    Lowest gear

    (climbing)

    19 mph

    Jeffsy Primus 24

    21 mph

    Jeffsy Primus 26

    24 mph

    Jeffsy Primus 27

    Highest gear

    (descending)

    Spec Level

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

    Geometry
    Specs
    Fork

    MANITOU MACHETE JUNIT, 24“ | 130 mm Travel | 110 x 15 mm Axle | Offset 42 mm Adjustable Rebound, Air Pressure

    Travel130mm

    Spring TypeAir

    ROCKSHOX REBA, 26“ | 140 mm Travel | 100 x 15 mm Axle | Offset 40 mm | Adjustable Rebound, Air Pressure

    Travel130mm

    Spring TypeAir

    ROCKSHOX LYRIK BASE, 27.5“ | 150 mm Travel | RC | 100 x 15 mm Axle | Offset 44 mm | Adjustable Rebound, Air Pressure

    Travel130mm

    Spring TypeAir

    Shock

    MANITOU MCLEOD, Shock Length: 190 mm | Shock Stroke: 40 mm ≙ 130 mm Travel 4-way Adjustable Compression, Rebound, Air Pressure

    Travel140mm

    Spring TypeAir

    ROCKSHOX DELUXE SELECT, Shock Length: 190 mm | Shock Stroke: 45 mm ≙ 140 mm Travel | Adjustable Rebound, Air Pressure, Custom Tune

    Travel140mm

    Spring TypeAir

    ROCKSHOX DELUXE SELECT, Shock Length: 230 mm | Shock Stroke: 60 mm ≙ 150 mm Travel | Adjustable Rebound, Air Pressure, Custom Tune 0L1

    Travel140mm

    Spring TypeAir

    Headset

    ACROS AZX-576, High Cap | 2 Spacer 5 mm

    ACROS AZX-576, High Cap | 2 Spacer 5 mm

    ACROS AZX-576, High Cap | 2 Spacer 5 mm

    Stem

    SDG JR, Length 40 mm | 31,8 mm Clamp | Rise +/-3°

    E13 BASE 35, Length 40 mm | 35 mm Clamp | Rise 0° | 6061 AL

    E13 BASE 35, Length 40 mm | 35 mm Clamp | Rise 0° | 6061 AL

    Handlebar

    SDG SLATER, Width 650 mm | Rise 20 mm | 8° Back Sweep | 5° Up Sweep

    E13 BASE 35, Width 760 mm | Rise 20 mm | 9° Back Sweep | 5° Up Sweep | 6061 AL

    E13 BASE 35, Width 760 mm | Rise 20 mm | 9° Back Sweep | 5° Up Sweep | 6061 AL

    Saddle

    YT Custom | Width 122 mm

    SDG BEL AIR 3.0, YT Custom | Width 140 mm I Lux-Alloy Rail

    SDG BEL AIR 3.0, YT Custom | Width 140 mm I Lux-Alloy Rail

    Seatpost

    YT POSTMAN V2, Ø 31.6 mm | 100 mm | Std. Remote I Adjustable drop 20 / 10 / 5 mm

    YT POSTMAN V2, Ø 31.6 mm | Length 100 mm | Standard-Remote | Adjustable drop 20 / 10 / 5mm

    YT POSTMAN V2, Ø 31.6 mm | 125 mm | Std. Remote I Adjustable drop 20 / 10 / 5 mm

    Grips

    SDJ SLATER JR, Lock On

    ODI ELITE MOTION V2.1, Lock On

    ODI ELITE MOTION V2.1, Lock On

    Groupset
    Rear Derailleur

    SRAM NX, 11-speed

    SRAM SX EAGLE, 12-speed

    SRAM SX EAGLE, 12-speed

    Crank

    SRAM X1, Crank Arm Length 155 mm | 30 T | DUB

    SRAM SX EAGLE, Crank Arm Length 165 mm | 30T | DUB

    SRAM SX EAGLE, Crank Arm Length 165 mm | 32T | DUB

    Shifters

    SRAM NX, 11-speed

    SRAM SX EAGLE, 12-speed

    SRAM SX EAGLE, 12-speed

    Cassette

    SRAM PG1130, 11-42T | 11-speed

    SRAM PG1210 Eagle, 11-50T | 12-speed

    SRAM PG1210 Eagle, 11-50T | 12-speed

    Brakes

    SRAM G2 R, Rotor CENTERLINE Ø front 160 mm / rear 160 mm Adjustable Reach

    SRAM G2 R, Rotor CENTERLINE Ø front 160 mm / rear 160 mm, Adjustable Reach

    SRAM G2 R, Rotor CENTERLINE Ø front 200 mm / rear 200 mm Adjustable Reach

    Wheels
    Rims

    SUNRINGLÉ DUROC 30, Aluminum Rims 24“ | Inner Width 26 mm | Front Hub 110 x 15 mm | Rear Hub 148 x 12 mm | Freehub HG

    SUNRINGLÉ DUROC, Aluminum Rims 26“ | Inner Width 26 mm | Front Hub 100 x 15 mm, Rear Hub 148 x 12 mm

    CRANKBROTHERS Synthesis Enduro 2 Alloy, Aluminum Rims 27.5“ | Inner Width 31.5/29.5 mm | Front Hub 15 x 100mm Boost | Rear Hub 148 x 12 mm

    Tires

    FRONT: MAXXIS MINION DHF I REAR: MAXXIS MINION DHR II, Front: Tire Size 24“ x 2.4 I EXO Casing I 3C MaxxTerra Compound I Tubeless Ready I, Rear: Tire Size 24“ x 2.3 I EXO Casing I Dual Compound I Tubeless Ready

    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

    FRONT: MAXXIS MINION DHF I REAR: MAXXIS MINION DHR II, Front: Tire Size 27.5“ x 2.4 I EXO Casing I 3C MaxxTerra Compound I Tubeless Ready I, Rear: Tire Size 27.5“ x 2.3 I EXO Casing I Dual Compound I Tubeless Ready

    Riders Also Compared