Onza Jackpot review

A bike that's almost ready for high-stakes trail gambling

Our rating 
3.5 out of 5 star rating 3.5
GBP £1,700.00 RRP

Our review

As a complete bike, it has some compromises, but Onza’s superbly detailed and versatile steel trail frame is a beauty
Buy if, You want a well-balanced steel hardtail that's ready for some hammer time, and are prepared to make a few upgrades
Pros: Lovely frame, efficient power transfer, surefooted handling
Cons: Lousy stock rubber, meh dropper post, hefty bars
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Let’s cut to the chase. If you’re wondering what the ‘almost’ part of our strapline refers to it’s primarily the very wooden, low grade ‘Sport’ tyres specced on Onza’s Jackpot hardtail.


They create a rattling, jarring, dynamically dead sufferfest. Switching rubber immediately released the Jackpot’s true ride quality – and we suggest you negotiate a similar change with the shop before you seal the deal.

Heart and soul

It’s definitely worth it too as the Jackpot frame is a real beauty. The gusset behind the tapered head tube is open to spread stress and the mid-sized 35mm top and down tubes use short butts to tune supple ride feel without losing too much traction feedback or precise wheel placement. The bottom bracket is a press-fit 30mm design, which is rare on steel frames and means any crank or a singlespeed-friendly eccentric BB will fit.

A 150mm rockshox revelation fork, fitted to the onza jackpot frame
Russell Burton

A hollow chainstay box leads into fat-tyre-friendly keyhole chainstays that flatten and round out before the 3D dropouts, with replaceable inserts for different axles. The curved inter-stay-reinforcing pipe matches the curve of the rear rotor, which is post-mounted for easy adjustment.

Related: Onza Payoff review

While the black finish on our frame didn’t show it off like the raw version of the frame-only option, the internal cable and dropper post insert ports, external brake guides and head badge are all brass-brazed in place to retain full strength of the steel tubes. You’re restricted to just 17 and 19in sizes though.

Not just a pretty frame

Presuming one of those fits, the trail is where the jackpot shows its real class. The stiff, big-axle Onza cranks lever all your power through the hollow box rear end and stout dropouts so it climbs and accelerates okay for a near-14kg bike.

An external dropper seatpost fitted to the onza jackpot as standard

The short but mid-sized tubes are stiff enough to really work the 150mm Revelation fork hard, but supple enough to skim the tops off rocks and roots to sustain speed and boost comfort in classic steel-frame fashion. While it’s not super-stretched, the handling is surefooted and well balanced for all-round aggro riding without wandering about on climbs.

The majority SLX stop/go equipment works fine but an externally routed dropper post on an internal routing-ready frame is disappointing and the Onza own brand bars are very heavy too.

The onza jackpot, out on the trails

Once we’d swapped out the wooden-feeling stock tyres, the Onza came to life


Onza’s Jackpot (and the 29er/27.5+ Payoff) are beautifully detailed, very versatile, steel frames that ride every bit as good as they look. But given the tyres need swapping immediately the complete bike price is expensive, which makes the frame-only options or Onza’s own reduced cost custom-build programme very tempting.

Product Specifications


Name Jackpot
Brand Onza

Available Sizes 17in 19in
Weight (kg) 13.72
Rims Anon 23mm
Saddle Fizik Gobi
Seat Angle 74
Seatpost Rock Shox Reverb external dropper
Shifters Shimano SLX
Stem Onza 6061 alloy 60mm
Wheelset Weinmann XC180 Disc
Rear Tyre Kenda Nevegal X Sport 27.5 x 2.35
Bottom Bracket Height (in) 11.81
Chainstays (in) 16.73
Seat Tube (in) 18.9
Standover Height (in) 29.72
Top Tube (in) 23.82
Wheelbase (in) 44.69
Rear Wheel Weight 2720
Rear Hub Anon 100x15mm/142x12mm axles
Bottom Bracket PF30
Front Hub Anon 100x15mm/142x12mm axles
Brakes Shimano Deore M447 - 180/160mm
Cassette Shimano HG50 11-36T
Chain Shimano SLX
Cranks Onza 1 x with buzz saw thick thin 32 T chain ring
Fork Rock Shox Revelation solo air 150mm with tapered alloy steerer
Frame Material Onza double butted flawless Cro-Mo 4130 27.5 Tapered headtube
Front Tyre Kenda Nevegal X Sport 27.5 x 2.35
Rear Derailleur Shimano SLX Shadow (Clutch)
Front Wheel Weight 2100
Grips/Tape Onza Ules lock on
Handlebar Onza 6061 alloy 760mm
Head Angle 67
Headset Type FSA Internal tapered
Pedals Alloy platform
Frame size tested 19in