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2017 YT Jeffsy AL Two 27 Bike (discontinued)

Average User Rating: (Excellent)
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Need more info? View our Enduro / All-Mountain Mountain Bikes buyer's guide.

A Lot of Bike for An Affordable Price

The Good:

Progressive, jumps well, flip chip, longer reach, spec for price

The Bad:

Hard to use all travel (very progressive), non-boost front paired to boost rear

Overall Review:

The Jeffsy 27 has been a really fun bike to get to know the past 2 months. I purchased the AL Two 27 as I had planned to swap parts out and put a build on I preferred. This is not to say that you go not get a ton of bike for the amount of money, but I had a build in mind. I've put the bike through DH tracks, jump lines, long pedal days and the everything in between. The bike is super progressive and takes getting use to. This is great for jumping and drops, but keep in mind you will have to ride aggressive to use full travel. The shock does tend to pack up (lack of a better term) on repeated successive hits, but holds it own otherwise. I do plan to swap the rear shock at some point, so will update the review when I do. Flip chip is nice for the long pedal days as it makes the bike feel a bit more agile on tight switch backs. Let down was the boost rear end paired to a non-boost fork. This has since been changed with the 2018 models, but seems like it could have been an easy decision to rectify when speccing the bikes originally. Regardless, it won't slow you or the bike down. Things that could be improved? Not much, purchase a more expensive build if you want better brakes/drive train/etc, but for the price, its a great buy.


Product YT Jeffsy AL Two 27 Bike
Model Year 2017
Riding Type Enduro / All-Mountain
Rider Unisex
Sizes and Geometry
S (Low, High), M (Low, High), L (Low, High), XL (Low, High) View Geometry
Size S (Low, High) M (Low, High) L (Low, High) XL (Low, High)
Top Tube Length 573mm 602mm 625mm 648mm
Head Tube Angle 66.5°, 67.0° 66.5°, 67.0° 66.5°, 67.0° 66.5°, 67.0°
Head Tube Length 95mm 110mm 125mm 135mm
Seat Tube Angle 75.0°, 75.5° 75.0°, 75.5° 75.0°, 75.5° 75.0°, 75.5°
Seat Tube Length 410mm 450mm 480mm 520mm
Bottom Bracket Height 15mm drop, 9mm drop 15mm drop, 9mm drop 15mm drop, 9mm drop 15mm drop, 9mm drop
Chainstay Length 430mm 430mm 435mm 435mm
Wheelbase 1138mm 1169mm 1200mm 1224mm
Standover 708mm 737mm 752mm 782mm
Reach 415mm 440mm 460mm 480mm
Stack 584mm 597mm 611mm 620mm
* Additional Info Geometry adjustable via flip chip
Wheel Size 27.5" (650b)
Frame Material Aluminum
Frame Material Details Air-formed aluminum
Rear Travel 150mm
Rear Shock RockShox Deluxe R DebonAir, external rebound, 230mm x 60mm
Fork RockShox Pike RC, Solo Air, low-speed compression, external rebound, tapered steerer, 100x15mm QR thru-axle, 42mm rake
Fork Travel 150mm
Head Tube Diameter Tapered
Headset Acros AZX-203, sealed with industrial bearings, ZS44/28.6 / ZS56/40
Handlebar Race Face Aeffect, 35mm clamp, 780mm width, 20mm rise, 8° backsweep, 5° upsweep
Stem Race Face Aeffect, 35mm clamp, 50mm length (S/M), 60mm length (L/XL)
Grips The Sensus Lite
Brakes SRAM Guide R, 4-piston 4S caliper, Centerline rotors, 200mm front, 180mm rear
Brake Levers SRAM Guide R, tool-free reach adjust
Drivetrain 2x
Shifters SRAM GX, 2x11
Front Derailleur SRAM GX
Rear Derailleur SRAM GX, 11-speed, Type 2.1, aluminum, black
Chainguide N/A
Cranks Race Face Aeffect SL, 175mm length
Chainrings Race Face Aeffect SL, 24/36 tooth
Bottom Bracket Race Face BB92
Pedals N/A
Chain SRAM PC1130, 11-speed, with PowerLock
Cassette SRAM XG1150, 11-speed, 10-42 tooth
Rims DT Swiss M1900 Spline
Hubs DT Swiss M1900 Spline, 100x15mm thru-axle front, 148x12mm thru-axle rear with XD driver
Tires Front: Maxxis High Roller II, EXO MaxxPro, 27.5" x 2.4"
Rear: Maxxis High Roller II, EXO MaxxPro 60a, 27.5" x 2.4"
Saddle SDG Fly MTN, custom YT Logo
Seatpost RockShox Reverb Stealth
S: 390mm length, 125mm travel; M,L,XL: 440mm length, 150mm travel
Seatpost Diameter 31.6mm
Seatpost Clamp Standard single bolt
Rear Dropout / Hub Dimensions 148x12mm Boost
Max. Tire Size
Bottle Cage Mounts Yes (single, small bottle)
Colors Black Pearl/Snow White
Warranty 3 years main frames, 2 years swingarm and other YT components
Weight 30 lb 10.3 oz (13,900 g)
Miscellaneous Virtual 4 Link suspension technology
Adjustable geometry via flip chip
Price $2,599
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