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YT Jeffsy 29 AL – 2017 specification and geometry

Posted by Matt | January 5, 2019 | 2 comments so far

As an aide memoire before the information disappears off the internet, this is the original specification of the Jeffsy 29er AL from 2017.

YT Jeffsy 29 AL spec 2017

Colour	Black Pearl/Blue Lagoon
Frame	Air-formed aluminium frame V4L Virtual 4-Link rear suspension, 12x148mm, DT Swiss QR Thru axle
Fork	RockShox Pike RC Solo air, RC damper cartridge, Compression to ‘Lock’, Rebound, Tapered steerer, 15x100mm QR Thru axle, 140mm travel
Rear shock	RockShox Monarch R Debonair air-can, external rebound, 7.875″x2.25″/ 200x57mm
Wheelset	DT Swiss M1900 Spline 29″ FW 15x100mm Thru Axle, RW 12x148mm Thru Axle
Shifters	Shimano SLX M670 2×10 speed
Rear derailleur	Shimano M675 10 speed Shadow Plus
Front derailleur	Shimano SLX M677 E-type, side swing, front pull
Cassette	Shimano SLX 10 speed 11-36
Chain	Shimano HG54
Chainset	Race Face Aeffect 175mm 24/36, BB92
Bottom Bracket	Race Face BB92
Brakes	Shimano SLX M675 2 piston, tool-free reach adjust, metal pad w/fin
Discs	Shimano SLX 200mm front/180mm rear
Seatpost	RockShox Reverb Stealth internal cable routing S: 390 mm/125 mm travel, M , L, XL: 440mm / 150mm travel, 31.6 mm
Saddle	SDG Circuit Cro-Mo rails, 280mm x 135mm
Headset	Acros AZX-203 ZS44;28.6 \| ZS56;40
Stem	Race Face Aeffect 35mm clamp, S, M: 50mm, L, XL: 60mm
Handlebar	Race Face Aeffect 760mm, 20mm Rise, 8° backsweep, 5° upsweep, 35mm clamp
Grips	Race Face Love Handle
Tyres	Onza Ibex 29×2.4″, 55a, FRC 120
Weight	14.3 Kg / 31.5 Lb

YT Jeffsy 29 geometry chart

Sizes	S	M	L	XL
A Toptube length	Size S571 mm	Size M592 mm	Size L616 mm	Size XL637 mm
B Reach	Size S405 mm	Size M425 mm	Size L445 mm	Size XL465 mm
C Stack	Size S605 mm	Size M610 mm	Size L623 mm	Size XL628 mm
D Seattube length	Size S400 mm	Size M440 mm	Size L480 mm	Size XL520 mm
E Chainstay length	Size S435 mm	Size M435 mm	Size L440 mm	Size XL440 mm
F Headtube angle low/high	Size S66.9 / 67.6 °	Size M66.9 / 67.6 °	Size L66.9 / 67.6 °	Size XL66.9 / 67.6 °
G Seattube angle (eff.) low/high	Size S74.7 / 75.3 °	Size M74.7 / 75.3 °	Size L74.7 / 75.3 °	Size XL74.7 / 75.3 °
H BB Drop low/high	Size S32/24 mm	Size M32/24 mm	Size L32/24 mm	Size XL32/24 mm
I Wheelbase	Size S1132 mm	Size M1154 mm	Size L1178 mm	Size XL1205 mm
J Headtube length	Size S90 mm	Size M95 mm	Size L110 mm	Size XL115 mm
K Steerer tube length	Size S551 mm	Size M551 mm	Size L551 mm	Size XL551 mm
L Fork offset	Size S46 mm	Size M46 mm	Size L46 mm	Size XL46 mm

Filed under Bikes in January 2019

About the author

Matt is one of the founding Molefathers of the Muddymoles, and is the designer and main administrator of the website.

Having ridden a 2007 Orange Five for many years then a 2016 YT Industries Jeffsy 29er, he now rocks a Bird Aether 9 and a Pace RC-627.

An early On-One Inbred still lurks in the back of the stable as a reminder of how things have moved on. You can even find him on road bikes - currently a 2019 Cannondale Topstone 105 SE, a much-used 2011 Specialized Secteur and very niche belt drive Trek District 1.

If you've ever wondered how we got into mountain biking and how the MuddyMoles started, well wonder no more.