2024 YT Jeffsy Core 1 Bike

(discontinued)

Discontinued

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Free shipping on orders over $50 (continental U.S. only). International shipping available. Some exclusions apply.	Free shipping on orders over $50 (continental U.S. only). International shipping available. Some exclusions apply. $3,599.94	Buy
Yt \| Jeffsy 29 Cf Core 4 2025 Bike \| Fog Green \| 2Xl	Yt \| Jeffsy 29 Cf Core 4 2025 Bike \| Fog Green \| 2Xl $3,599.94	Buy
Free shipping on orders over $69 (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 1 Bike

Model Year

2024

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 flip chip in rear shock mount. • All specifications listed are with 150mm travel fork with 44mm offset.

Sizes Additional Info

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

Wheel Size

29"

Frame Material

Aluminum

Frame Material Details

Forged multi-butted aluminum alloy; molded seatstay, chainstay, and bolt-on down tube protection

Rear Travel

145mm

Rear Shock

RockShox Deluxe Select+, RT damper, 210mm length x 55mm stroke

Fork

RockShox Lyrik Base, Rush RC damper, 44mm offset, 35mm stanchions

Fork Travel

150mm

Head Tube Diameter

Tapered, 1.125" top, 1.5" bottom

Headset

ACROS AZX-576; ZS44 upper, ZS56 lower

Handlebar

e*thirteen Base, 6061 AL alloy, 780mm width, 35mm rise, 9° backsweep, 5° upsweep, 35mm clamp diameter

Stem

e*thirteen Base, 6061 AL alloy, 50mm length, 0° rise, 35mm bar clamp

Grips

ODI Elite Motion V2.1, lock-on

Brakes

SRAM DB8, 4-piston, SRAM CenterLine 200mm rotors

Brake Levers

SRAM DB8, tooled Reach Adjust

Drivetrain

Shifters

SRAM NX Eagle, 12-speed

Front Derailleur

None

Rear Derailleur

SRAM NX Eagle, 12-speed

ISCG Tabs

ISCG05

Chainguide

None

Cranks

SRAM NX Eagle Alloy DUB, 170mm length

Chainrings

SRAM NX Eagle, 32 tooth

Bottom Bracket

SRAM DUB MTB Wide, 73mm English/BSA threaded

Pedals

None

Chain

SRAM Eagle, 12-speed

Cassette

SRAM SX Eagle PG-1210, 12-speed, 11-50 tooth

Rims

SUNringlé SR329 Trail Comp, aluminum, 30mm inner width

Hubs

SUNringlé Trail Comp wheelset, 15mm x 110mm (Boost) front, 12mm x 148mm (Boost) rear with HG driver

Spokes

SUNringlé Trail Comp 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, 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

Drip Yellow, Black Magic

Warranty

5 years frame

Weight

35 lb 4.4 oz (16,000 g)

Miscellaneous

• MKIII version
• V4L (Virtual 4-Link) rear suspension design
• Internal cable routing
• Geometry adjustable via flip chip in rear shock mount
• SRAM UDH (Universal Derailleur Hanger)
• Weight given for size SM set up tubeless
• Includes Thirstmaster 6000 water bottle and side-load cage
• Includes removable HEX6 tool in rear axle
• EU/UK price: 2499 EUR/GBP

Price

$2,799.00

More Info

Starting at $2,799, Updated Geo and Travel - YT Jeffsy First Ride

Analyzing YT's Core and Uncaged Jeffsy Models

YT website

Review This Product

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Free shipping on orders over $50 (continental U.S. only). International shipping available. Some exclusions apply.	Free shipping on orders over $50 (continental U.S. only). International shipping available. Some exclusions apply. $3,599.94	Buy
Yt \| Jeffsy 29 Cf Core 4 2025 Bike \| Fog Green \| 2Xl	Yt \| Jeffsy 29 Cf Core 4 2025 Bike \| Fog Green \| 2Xl $3,599.94	Buy
Free shipping on orders over $69 (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