trail/all mountain 29 - expert

Eccentric Cromo

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Bike info

- advanced cromoly frame built with multi-butted Tange Eccentric tubes, featuring elegant CNC’ed 148x12 dropouts

- Manitou Machete, 27.5+/29" fork with 140mm Travel

- aftermarket NS Bikes cockpit that includes Terra handlebar and Quantum Lite stem

- New tubeless ready rims (Plus compatible) build on NS Bikes sealed bearings hubs

- Brakes: SRAM Level T 180 front & rear

- fast rolling Maxxis Ardent tires

- available in 3 frame sizes (16”, 17.5” & 19.5”)

This heart of this beautiful 29'er is the amazing steel frame built with custom drawn Tange tubes with built in gussets.


It has very aggressive modern geometry with a very long reach and a super slack head angle. The weight of the frame is approximately 2.4kg which is light by any standards, but don’t worry, it’s strong enough to hold up to a lot of abuse. All the know-how that we have managed to acquire over the years in building steel dirt-jump hardtails has been funnelled into this frame and we are sure it's the very best money can buy. This is really a very unique looking bike and it rides like a dream.

Bike Specs

Frame Specs

Frame: NS Bikes 4130 Cromoly frame, built with Tange Eccentric tubes

Fork: Manitou Machete, 27.5+ fork with 140mm Travel

Headset: integrated tapered IS42/52, sealed bearings

Stem: NS Quantum Lite 31.8, 45mm

Handlebar: NS Terra (762mm / 30” wide)

Grips: Octane One bolt-on, one-clamp

Brakes: SRAM Level T 180 front & rear

Shifter: SRAM NX trigger 11speed

Derailleur: SRAM NX 1x11 X-HORIZON™

Bottom bracket: Truvativ GXP 73mm

Cranks: SRAM NX Boost 1x X-SYNC™ 30t, 170mm

Chain: KMC, 11 spd

Cassette: SRAM PG-1130 11 speed 11-42t

Rims: Shining DB-T29, 29”, 32h, tubless ready

Hubs: NS Rotary 15 disc Boost (sealed bearing), NS Rotary cassette 148x12 Boost (sealed bearings)

Spokes: 14G-2.0mm w/ 14mm nipples

Tires: Maxxis Ardent Skinwall 29x2.25 foldable bead 60 TPI Skinwall

Seatpost: Kalloy, 30.9mm

Saddle: SDG Circuit MTN saddle w/cromoly rails

Pedals: -

Weight: ~13 kg (w/o pedals)

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 2.3”, 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)



Eccentric Cromo   S M L
Wheel size 29"
Fork travel 140 140 140
Reach mm 415 435 460
in 16,3 17,1 18,1
FC mm 740 764 793
in 29,1 30,1 31,2
Standover mm 792 815 841
in 31,2 32,1 33,1
Stack mm 627 636 645
in 24,7 25,0 25,4
Effective TT mm 595 617 645
in 23,4 24,3 25,4
Actual TT mm 583 596 618
in 23,0 23,5 24,3
Seat tube mm 407 445 495
in 16,0 17,5 19,5
Chain stays mm 420 420 420
in 16,5 16,5 16,5
BB rise mm -55 -55 -55
in -2,2 -2,2 -2,2
Headtube angle 65,0 65,0 65,0
ST angle effective 74,0 74,0 74,0
Wheelbase mm 1154 1179 1208
in 45,4 46,4 47,6