trail/all mountain 29 - expert

Eccentric Cromo 29

More info



Bike info

Custom drawn Tange Eccentric cromoly tubes
Radical geo with slack angles
Rock Shox Recon boost140mm
X-FUSION MANIC dropper post
Shimano deore crankset

Stay True, stay eccentric! Radical, modern geometry with a very long reach and a super slack head angle make this bike ideal for anyone who likes to go full gas! This heart of this beautiful 29'er is the amazing steel frame built with custom drawn Tange tubes with built-in gussets. At around 2.4 kg the frame is light by any standards, but don’t worry, it’s strong enough to hold up to a lot of abuse. All the experience we’ve acquired over the years in building steel dirt-jump hardtails has been funneled into this frame and we are sure it's the very best money can buy. This is really a unique looking bike and with the big wheels and dropper post that are included in the package, it rides like a dream both up and down mountains. the heart of a dirt jump bike. We love the fact that this bikes wants to be thrown around and changes direction with minimal input." - Singletrack



Bike Specs

Main features

Frame Specs

Media Review

frame: NS Bikes 4130 cromoly frame, built with Tange Eccentric tubes, Boost 148x12 dropouts

sizes: S,M,L

rear shock: /

forks: Rock Shox Recon 140mm travel, 15x110mm Boost, 1.5 tapered steerer tube

headset: GW integrated tapered IS42/IS52, sealed bearings

stem:  NS Tone 31.8, 45mm

handlebar: NS Bar 31.8, 780mm 20mm rise

grips:  NS Hold Fast

seatpost: X-Fusion Manic internal 125, 150mm

saddle: Octane One Rocket2, CrMo hollow rails

front brake: Shimano MT410, 180mm

rear brake: Shimano MT410, 180mm

levers: Shimano 

rims:  Octane One Solar 29”, 32h, tubeless compatible

spokes: Spokes w/14mm nipples

front hub:  NS Rotary 15 Boost 110x15 disc (sealed bearings)

rear hub:  NS Rotary Cassette 148x12mm Boost (sealed bearings)

tires front / rear: Maxxis DHF EXO/TR 29x2.5" WT / Maxxis Aggressor EXO/TR 29x2.5" WT

crankset: Shimano Deore FCMT5101 170mm 32t

bottom bracket: Shimano BSA 73mm

pedals: /

chain: Shimano, 12 spd

chainguide: /

derailleurs: Shimano Deore M6100, 12spd

shifters: Shimano Deore M6100, 12spd

cassette: Sunrace CSMZ800, 12spd 11-51T

weight (kg): 13.9

Specifications subject to change without notice. Actual colours and design may vary slightly from the images on the website.

Tubes: custom butted 4130 cromoly, Tange Eccentric tubes

Recommended fork travel: 130-150mm

Head tube: integrated tapered IS42/IS52

Head tube length: S size: 105mm, M size: 115mm, L: 125mm

Fits forks: fits forks with standard 1-1/8” or tapered 1.5 1-1/8” steerer tubes

BB: threaded 73mm with ISCG-05 mounts

Biggest chainring: BOOST only up to 32t

Front derailleurs: high clamp only, top pull

Seat post/clamp: seat post: 30.9 / seat clamp: 34.9

Cable routing: stealth cable route in seat tube for dropper post

Wheel/tyres: designed to fit 29” but works also with 650B+ wheels with tires up to 3.0“

Maximum tire size recommended: 29” x 2.5”, 650B x 3.0”

Disc brake: IS-2000 disc brake mount, max rotor size: up to 185mm

Hub spacing: 148x12mm, NS axle included

Frame available: in 3 frame sizes: S 16”, M 17.5” & L 19.5”

Weight: ~2.59kg (M size)


Most progressive frame geometry on the market.



Tange eccentric cromoly tubes (eccentric cromo).


NS Bikes aftermarket components in unique finishes.

EnduroMTB: Eccentric
Singletrack World: Eccentric Cromo


Eccentric Cromo   S M L
Wheel size 29"
Fork travel 140 140 140
Reach mm 425 450 475
in 16.7 17.7 18.7
FC mm 760 779 809
in 29.9 30.7 31.9
Standover mm 745 767 802
in 29.3 30.2 31.6
Stack mm 641 641 650
in 25.2 25.2 25.6
Effective TT mm 609 634 662
in 24.0 25.0 26.1
Actual TT mm 583 603 629
in 23.0 23.7 24.8
Seat tube mm 412 450 500
in 16.2 17.7 19.7
Chain stays mm 430 430 430
in 16.9 16.9 16.9
BB rise mm -60 -60 -60
in -2.4 -2.4 -2.4
Headtube angle 65,0 65,0 65,0
ST angle effective 74,0 74,0 74,0
Wheelbase mm 1183 1203 1232
in 46.6 47.4 48.5