2025 YT Jeffsy Core 3 CF Bike

3 cf grey 01.png?VersionId=AXmivRhsYRLbjQ3rSE.2R

3 cf black 02.png?VersionId=LlheSkxXMZxK1mVMPmv1tLLOvAr

3 cf grey 02.png?VersionId=rfGWfBzmfmgSytkLcMydeEFF

3 cf black 02.png?VersionId=61sx1X4mF18PPavKa

Where To Buy
	Free shipping on orders over $50 (continental U.S. only). International shipping available. Some exclusions apply.	Browse available Bikes
	Free U.S. shipping on everything. International shipping available. Some exclusions apply.	Browse available Bikes
	Free shipping on orders over $50 (contiguous U.S. only). International shipping available. Some exclusions apply.	Browse available Bikes

Specifications

Product

YT Jeffsy Core 3 CF Bike

Model Year

2025

Intended Use

Enduro / All-Mountain

Trail

Rider

Unisex

Sizes and Geometry

SM (low, high)

MD (low, high)

LG (low, high)

XL (low, high)

XXL (low, high)

View Full Geometry

Size	SM (low, high)	MD (low, high)	LG (low, high)	XL (low, high)	XXL (low, high)
Top Tube Length	578mm, 562mm	593mm, 585mm	609mm, 607mm	627mm, 630mm	645mm, 652mm
Head Tube Angle	65.0°, 65.6°	65.0°, 65.6°	65.0°, 65.6°	65.0°, 65.6°	65.0°, 65.6°
Head Tube Length	100mm	108mm	116mm	124mm	132mm
Seat Tube Angle	76.9°, 77.5°	77.5°, 78.1°	77.9°, 78.5°	78.3°, 78.9°	78.6°, 79.2°
Seat Tube Length	385mm	410mm	435mm	460mm	485mm
Bottom Bracket Height	343mm (33mm drop), 351mm (25mm drop)	343mm (33mm drop), 351mm (25mm drop)	343mm (33mm drop), 351mm (25mm drop)	343mm (33mm drop), 351mm (25mm drop)	343mm (33mm drop), 351mm (25mm drop)
Chainstay Length	437mm, 435mm	437mm, 435mm	437mm, 435mm	442mm, 440mm	442mm, 440mm
Wheelbase	1191mm, 1189mm	1214mm, 1213mm	1238mm, 1236mm	1266mm, 1265mm	1289mm, 1288mm
Standover	730mm, 738mm	728mm, 736mm	732mm, 740mm	738mm, 746mm	742mm, 750mm
Reach	435mm, 442mm	455mm, 462mm	475mm, 481mm	495mm, 501mm	515mm, 521mm
Stack	613mm, 608mm	620mm, 615mm	627mm, 622mm	634mm, 629mm	642mm, 636mm
Additional Info	• Geometry adjustable via two-position flip chip in rear shock mount • All specifications listed are with 150mm travel fork with 44mm offset

Sizes Additional Info

• Geometry adjustable via two-position flip chip in rear shock mount
• All specifications listed are with 150mm travel fork with 44mm offset

View Full Geometry

Size	SM (low, high)	MD (low, high)	LG (low, high)	XL (low, high)	XXL (low, high)
Top Tube Length	578mm, 562mm	593mm, 585mm	609mm, 607mm	627mm, 630mm	645mm, 652mm
Head Tube Angle	65.0°, 65.6°	65.0°, 65.6°	65.0°, 65.6°	65.0°, 65.6°	65.0°, 65.6°
Head Tube Length	100mm	108mm	116mm	124mm	132mm
Seat Tube Angle	76.9°, 77.5°	77.5°, 78.1°	77.9°, 78.5°	78.3°, 78.9°	78.6°, 79.2°
Seat Tube Length	385mm	410mm	435mm	460mm	485mm
Bottom Bracket Height	343mm (33mm drop), 351mm (25mm drop)	343mm (33mm drop), 351mm (25mm drop)	343mm (33mm drop), 351mm (25mm drop)	343mm (33mm drop), 351mm (25mm drop)	343mm (33mm drop), 351mm (25mm drop)
Chainstay Length	437mm, 435mm	437mm, 435mm	437mm, 435mm	442mm, 440mm	442mm, 440mm
Wheelbase	1191mm, 1189mm	1214mm, 1213mm	1238mm, 1236mm	1266mm, 1265mm	1289mm, 1288mm
Standover	730mm, 738mm	728mm, 736mm	732mm, 740mm	738mm, 746mm	742mm, 750mm
Reach	435mm, 442mm	455mm, 462mm	475mm, 481mm	495mm, 501mm	515mm, 521mm
Stack	613mm, 608mm	620mm, 615mm	627mm, 622mm	634mm, 629mm	642mm, 636mm
Additional Info	• Geometry adjustable via two-position flip chip in rear shock mount • All specifications listed are with 150mm travel fork with 44mm offset

Wheel Size

29"

Frame Material

Carbon Fiber

Frame Material Details

High-Modulus Carbon front and rear triangles; molded seatstay, chainstay, and bolt-on lower down tube protection

Rear Travel

145mm

Rear Shock

RockShox Super Deluxe Ultimate RC2T, 210mm length x 55mm stroke

Fork

RockShox Lyrik Ultimate, Charger 3.1 damper, 35mm stanchions, 44mm offset

Fork Travel

150mm

Head Tube Diameter

Tapered, 1.125" top, 1.5" bottom

Headset

Cane Creek Series 40; ZS44 upper, ZS56 lower

Handlebar

Renthal, AL2014 alloy, 780mm width, 30mm rise, 7° backsweep, 5° upsweep, 35mm clamp diameter

Stem

Renthal Apex, 50mm length, 6° rise, 35mm bar clamp

Grips

ODI Elite Motion V2.1, lock-on

Brakes

Hayes Dominion A4, 4-piston, 203mm 6-bolt rotors

Brake Levers

Hayes Dominion A4, tool-free reach adjust

Drivetrain

Shifters

SRAM Eagle Pod Controller, 12-speed, AXS electronic wireless

Front Derailleur

None

Rear Derailleur

SRAM S1000 Eagle Transmission, 12-speed, AXS electronic wireless

ISCG Tabs

ISCG05

Chainguide

None

Cranks

SRAM S1000 Eagle Transmission Alloy DUB, 170mm length

Chainrings

SRAM S1000 Eagle Transmission, 32 tooth, with bolt-on bashguards

Bottom Bracket

SRAM DUB MTB Wide, 92mm PressFit

Pedals

None

Chain

SRAM Eagle Transmission, 12-speed

Cassette

SRAM S1000 Eagle Transmission XS-1270, 12-speed, 10-52 tooth

Rims

Crankbrothers Synthesis Enduro Alloy, 31.5mm inner width front, 29.5mm inner width rear

Hubs

Crankbrothers Synthesis Enduro wheelset, 15mm x 110mm (Boost) front, 12mm x 148mm (Boost) rear with HG driver

Spokes

Crankbrothers Synthesis Enduro wheelset

Tires

Front: Maxxis Minion DHF, 3C MaxxTerra compound, EXO+ casing, TR, 29" x 2.5"
Rear: Maxxis Minion DHR II, 3C MaxxTerra compound, EXO+ casing, TR, 29" x 2.4"

Saddle

SDG Bel-Air 3.0 Overland, Lux-Alloy rails, 140mm width, YT Custom design

Seatpost

YT Postman V2 dropper, 5/10/20mm adjustable travel, MMX-bracket remote lever
Drop: 125mm (SM), 150mm (MD), 170mm (LG), 200mm (XL), 230mm (XXL)

Seatpost Diameter

31.6mm

Seatpost Clamp

Single bolt

Rear Dropout / Hub Dimensions

12mm x 148mm (Boost)

Max. Tire Size

Bottle Cage Mounts

One inside front triangle, plus accessory mounts under top tube

Colors

Concrete Grey, Black Magic

Warranty

5 years frame

Weight

33 lb 4.6 oz (15,100 g)

Miscellaneous

• MKIII version
• V4L (Virtual 4-Link) rear suspension design
• Internal cable routing with internal tubes
• Geometry adjustable via two-position flip chip in rear shock mount
• STASH down tube storage with double-sealed waterproof lid and two neoprene bags
• SRAM UDH (Universal Derailleur Hanger)
• Weight given for size SM set up tubeless, without bottle/cage
• Includes Thirstmaster 6000 water bottle and side-load cage
• Includes removable HEX6 tool in rear axle
• EU/UK price: 4999 EUR/GBP
• Canadian price: 7199 CAD

Price

$4,999.00

More Info

YT Introduces the Updated Jeffsy Core Range (press release)

YT website

Review This Product

What do you think?

Where To Buy
	Free shipping on orders over $50 (continental U.S. only). International shipping available. Some exclusions apply.	Browse available Bikes
	Free U.S. shipping on everything. International shipping available. Some exclusions apply.	Browse available Bikes
	Free shipping on orders over $50 (contiguous U.S. only). International shipping available. Some exclusions apply.	Browse available Bikes