YT Jeffsy 29 2020 Geometry | Size Chart & Analysis

Sizing up the YT Jeffsy 29 2020? Compare its reach, stack, and handling against 200+ bikes with our Bike Geometry Comparison and Fit Calculator.

Sizes	S	M	L	XL	XXL
A Toptube length	572 mm	593 mm	615 mm	638 mm	660 mm
B Reach	430 mm	450 mm	470 mm	490 mm	510 mm
C Stack	618 mm	622 mm	627 mm	636 mm	640 mm
D Seattube length	400 mm	415 mm	435 mm	460 mm	485 mm
E Chainstay length	435 mm	435 mm	435 mm	440 mm	440 mm
F Headtube angle	66 / 66,5 °	66 / 66,5 °	66 / 66,5 °	66 / 66,5 °	66 / 66,5 °
G Seattube angle (eff.)	77 / 77,5 °	77 / 77,5 °	77 / 77,5 °	77 / 77,5 °	77 / 77,5 °
H BB Drop	32 / 24 mm	32 / 24 mm	32 / 24 mm	32 / 24 mm	32 / 24 mm
I Wheelbase	1182 mm	1204 mm	1226 mm	1255 mm	1277 mm
J Headtube length	100 mm	105 mm	110 mm	120 mm	125 mm
K BB height	344 / 352 mm	344 / 352 mm	344 / 352 mm	344 / 352 mm	344 / 352 mm

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More YT geometry: YT Capra 2025 Geometry, YT Capra 27.5 2020 Geometry, YT Capra 29 2020 Geometry, YT Decoy 2025 Geometry, YT Decoy 27.5 2020 Geometry.

Compare trail bikes: 2023 Giant Stance Geometry, 2023 Giant Trance Geometry, 2023 Norco Fluid FS Geometry.

Ride character of the YT Jeffsy 29 2020

In size L, the YT Jeffsy 29 2020 pairs balanced 435 mm chainstays that keep it lively without feeling nervous; a 66.0° head angle that splits the difference between descending calm and quick steering; a moderate 470 mm reach; a low-slung bottom bracket (~32 mm drop) that corners with confidence (mind pedal strikes).

Those numbers describe how it steers and sits. How the suspension actually feels, small-bump sensitivity, mid-stroke support and bottom-out ramp, comes down to its leverage and anti-squat curves: see our MTB suspension kinematics guide, and put its geometry head-to-head with any other bike in the geometry comparison tool.

About Us

Bikometry is a discipline focused on the science and art of understanding the geometry and linkage of mountain bike frames and their suspension systems.

This intricate field studies the angles, distances, and details that define a bike's performance on various terrains. Every aspect, from the head tube angle to the chainstay length, influences how the bike behaves.

Linkage, which connects the rear wheel to the bike frame, combined with the suspension, ensures smooth rides by absorbing shocks from the terrain.

By understanding bikometry, whether you're a designer, professional rider, or enthusiast, you can optimize bike performance, choose the right model, or even craft a custom bike. Dive into bikometry with us and explore the nuances that make mountain biking exhilarating.

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Related Geometry

Ride character of the YT Jeffsy 29 2020

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