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Planet X Jack Flash 29er SRAM SX Mountain Bike Planet X Jack Flash 29er SRAM SX Mountain Bike
From £699.99
FINANCE From £22.42/mth* More info
In stock Bikes in stock built within 15 - 17 working days.

Retro styling with modern geometry. The 29er Jack Flash keeps the looks of its 26 Inch Dirt jumping cousin but rolled out into a progressive trail hardtail package.

Weve kept the things you love, the gusseted headtube junction and X stamped chain stay bridge, the clearance and low stand over height, but refined the design to give you a progressive trail bike compatibe with modern componetry.

The 2020 Jack Flash features:

  • SRAM SX drivetrain
  • RockShox Judy - TurnKey lockout
  • Custom designed chainstay yoke
  • Classic reinforced downtube gusset
  • Alex Rim/Formula hub 29er wheels
Full description and spec

Size guide and geometry

Description

What happens when you take the Iconic Planet X Jack Flash Frame but update it for a modern crowd. Weve kept the things you love, the gusseted headtube junction and X stamped chain stay bridge, the clearance and low stand over height, but refined the design to make it more functional and easier to build and maintain with modern components. With progressive geomerty focused on trail riding this 130mm 29er hardtail will be able to attack any trail you throw at it. Other features include stealth dropper routing, internal cables and wide tyre clearance.

Rockshox Judy Silver TK 29" Boost Fork for uncompromised control at an affordable price.130mm of super smooth travel for attacking the trail without unbalancing the handling. Full size legs for accurate handling and smooth stroke however hard you ride. Adjustable DebonAir spring and Motion Control damping are easy to adjust for every ride and rider.

SX is SRAM's entry level Eagle groupset. Positive, 12 speed sequential shifting up to a 51 tooth wall climbing winch. Clutch rear mech and X-Sync2 tech for quiet chain security however rowdy you get. Ultra durable steel chainring with DUB axle to power up climbs and laugh off big landings. SRAM Level hydraulic disc brakes for effective, lightweight all weather control.

Approx Weight: 14kg (Medium)

Full Spec

Custom options available
On components showing this spanner
Brake Setup UK Brake Lever Setup Rear Brake Left
Seatpost On-One Twelfty V2 6061 Alloy Seatpost / 31.6mm / 400mm / Black
Seat Clamp On-One Forged Alloy Bolt Up Seatclamp V2 / 34.9mm / 13mm / Black  
Bar Tape / Grips On-One Knurl EVO Grip / Black  
Handle Bar On-One Enduro6 Riser Handlebar / 780mm / 31.8mm / Black  
Saddle San Marco Monza Start Saddle / Black / Carbon Steel  
Tyre Vittoria Saguaro Folding Tyre / 29 inch / TNT 2.2" / Black  
Stem On-One Hot Box V2 Stem / 50mm / 7 Degree / 31.8mm  
Chain SRAM SX Eagle 12 Speed Chain / 126 Link  
Brake SRAM Level Hydraulic Disc Brake / Rear / 1600mm / 20 Post to IS  
Brake SRAM Level Hydraulic Disc Brake / Front / 900mm / Post Mount 20mm Spacers  
Gear Levers SRAM SX Eagle Trigger Shifter / 12 Speed Right  
Crank Set SRAM SX Eagle DUB Crankset / 170mm / 32 Tooth / BOOST  
Cassette SRAM PG-1210 Eagle 12 Speed Cassette / 11-50  
Rear Mech SRAM SX Eagle Rear Mech / 12 Speed  
Wheel Pair Mach1 Trucky 29er on Novatec Boost 6 Bolt Wheelset / Shimano 11 Speed  
Fork Rockshox Judy Silver TK 29" Boost Fork / 130mm / 15x110mm / Gloss Black / Crown Adjust  
Brake spare SRAM Hydraulic Hose Fitting Kit Includes Barb And Olive / Single Olive  
Brake spare SRAM Hydraulic Hose Fitting Kit Includes Barb And Olive / Single Barb  
Inner Tube Panaracer Inner Tube / 29 inch / 1.75-2.35 inch / Presta 48mm  
Head Set Planet X Headset Spacer Set / 1 1/8" / 15mm + 10mm + 5mm / Black  
Brake spare Jagwire Vortex Vento 6 Bolt 180mm Disc Rotor  
Brake spare Jagwire Vortex Vento 6 Bolt 160mm Disc Rotor (Rever Branded)  
Bottom Bracket SRAM DUB BSA Bottom Bracket / 73mm  
Head Set Selcof Zero Stack / Semi-Integrated Cup Cartridge Bearing Headset For Tapered 1 1/8th 1.5 Fork Steerer  

Frame Details

Frame Material6061-T6
Frame Weight, Approx, (med) (g)2kg
Fork 120-130mm
RR Axle (mm)148 BOOST M12 x 1.75, 12mm thread, 169mm
Seatpost Size (mm)31.6
Seat Clamp Size (mm)34.9
Front Mech TypeNA
Wheels29er
Max Tyre29 x 2.4"
Mudguard mountsNA
Rack MountsNA
Bottle Cage Bosses1x
Brake TypeDISC POST
Bottom BracketBSA 73mm 
Headset TypeSelcof Zero Stack : Tapered / IS44/28.6 IS56/40 
Fork Length (mm)530
Cable RoutingINT/EXT
Dropper CompatibleStealth
 

Buying a bike from Planet X?

Why are prices so low?
We sell direct to the customer. With Planet X you get unrivalled value for money as we cut out the middleman. By designing and building everything ourselves, we provide excellent service, and make sure you get exactly what you pay for. This means we deliver first-class bikes, components, and accessories at the best prices in our industry.

How it works
You order your bike your way. Simply select the frame size and colour you want and choose from the range of customisation options with components to fit your needs. Your bike will be passed to one of our expert mechanics to build your bike exactly the way you want it.

Buying online in confidence
For advice on sizing and specifications, contact us via Live Chat and one of our in-house experts will be happy to assist with perfecting your bike. More information on building a bike is available on our dedicated bikes built to order page

Buy in confidence

Built in the UK

2 year warranty

Custom built to your specifications

Built to order in the UK
Built to order in the UK

We design and assemble every bike we sell right here in Yorkshire. Working with the leading component vendors and fabrication facilities, we create bikes with unrivalled performance and provide exceptional value for money.

Chat with one of our experts today and we will help put together the custom bike of your dreams.

Geometry

Size

Geometry

Sizing Guide

Rider HeightSuggested Frame Size
5'7" - 5'11"Medium / 510mm"
5'10" - 6'1"Large /540mm"
6' = 6'4"X-Large / 570mm

Sizing Notes

All frame size recommendations are approximate. A good fit will also depend on the correct choice of stem length, correct bike set-up for the rider and riding style.

Correct frame size choice can vary greatly with riders' torso length. If you have longer legs and a shorter torso, go for a slightly shorter stem. If you think you are borderline between sizes, and you have longer legs and a shorter torso, go for the smaller frame size. If you have shorter legs and a longer torso, go for the larger frame size to get the extra top tube length.

As the frame sizes increase, so does the length of the head tube. If you are inflexible or perhaps have a history of back problems, consider going for a larger frame size. This will increase the relative height of the handlebars making the position less “extreme”. The larger frame will also have a longer top tube, so you’ll need to compensate for this with a shorter stem.

Need help? Contact our technical experts

Visit our Contact Us page

Custom build option available
add to basket and customise
Build your bike in 3 simple steps.
Step 1: Select size and colour (by choosing below)
Frame View size guide
Large Satin Black Large Satin Black £699.99
Customise
Large Gloss Burnt Orange Large Gloss Burnt Orange £699.99
Customise
Large Gloss Red Large Gloss Red £699.99
Customise
Large Zesty Lime Large Zesty Lime £699.99
Customise
Medium Satin Black Medium Satin Black £699.99
Customise
Medium Gloss Burnt Orange Medium Gloss Burnt Orange £699.99
Customise
Medium Gloss Red Medium Gloss Red £699.99
Customise
Medium Zesty Lime Medium Zesty Lime £699.99
Customise
X Large Satin Black X Large Satin Black £699.99
Customise
X Large Gloss Burnt Orange X Large Gloss Burnt Orange £699.99
Customise
X Large Gloss Red X Large Gloss Red £699.99
Customise
X Large Zesty Lime X Large Zesty Lime £699.99
Customise
Step 2: Choose your options

Need help?

Contact our technical experts

Choose Components

Brake Setup Choose your braking setup.
Select
UK Brake Lever Setup Rear Brake Left  FREE i
Select
EURO - USA Hydraulic Disc Brake Lever Setup Rear Brake Right £50.00 i
Frame
Select
Planet X Jack Flash 29er FrameX Large | Gloss Red  FREE i
Select
Planet X Jack Flash 29er FrameMedium | Gloss Red  FREE i
Select
Planet X Jack Flash 29er FrameLarge | Gloss Red  FREE i
Select
Planet X Jack Flash 29er FrameX Large | Gloss Burnt Orange  FREE i
Select
Planet X Jack Flash 29er FrameMedium | Gloss Burnt Orange  FREE i
Select
Planet X Jack Flash 29er FrameLarge | Gloss Burnt Orange  FREE i
Select
Planet X Jack Flash 29er FrameX Large | Satin Black  FREE i
Select
Planet X Jack Flash 29er FrameMedium | Satin Black  FREE i
Select
Planet X Jack Flash 29er FrameX Large | Zesty Lime  FREE i
Select
Planet X Jack Flash 29er FrameLarge | Satin Black  FREE i
Select
Planet X Jack Flash 29er FrameMedium | Zesty Lime  FREE i
Select
Planet X Jack Flash 29er FrameLarge | Zesty Lime  FREE i
Seatpost
Select
On-One Twelfty V2 6061 Alloy Seatpost31.6mm | 400mm | Black  FREE i
Select
Rockshox Reverb Stealth Dropper Seatpost31.6mm | 2000mm Left | 467mm | 175mm £150.00 i

Optional Accessories

Bottle Cage We're famous for our bottle cages, don't miss out and treat your yourself to a bottle cage for your new bike.
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NO THANKS  FREE
Select
Zefal Aluplast 124 Bottle CageOrange £3.99 i
Select
Planet X Alloy Bottle CageSIlver £3.99 i
Select
Zefal Spring Bottle CageWhite £3.99 i
Select
Zefal Aluplast 124 Bottle CageBlue £3.99 i
Select
Planet X Alloy Bottle CageBlack £3.99 i
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Zefal Aluplast 124 Bottle CageRed £3.99 i
Select
Zefal Aluplast 124 Bottle CageYellow £3.99 i
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Zefal Aluplast 122 Bottle CageBlue £4.99 i
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Zefal Aluplast 122 Bottle CageTi-Grey £4.99 i
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Zefal Aluplast 122 Bottle CageBlack £4.99 i
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Planet X Nightwolf Plastic Bottle CageBlack £4.99 i
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Zefal Aluplast 124 Bottle CageSilver £4.99 i
Select
Zefal Spring Bottle CageBlack £4.99 i
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Zefal Aluplast 124 Bottle CageBlack £4.99 i
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Planet X Bi Plastic Bottle CageBlack £4.99 i
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Zefal Aluplast 122 Bottle CageRed £4.99 i
Select
Zefal Aluplast 122 Bottle CageWhite £4.99 i
Select
Planet X Fang Plastic Bottle CageBlack £5.99 i
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Zefal Pulse B2 Bottle CageOrange £12.99 i
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Zefal Pulse B2 Bottle CageCyan Blue £12.99 i
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Zefal Pulse B2 Bottle CageWhite £12.99 i
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Zefal Pulse B2 Bottle CageNeon Yellow £12.99 i
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Zefal Pulse B2 Bottle CageRed £12.99 i
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Zefal Pulse B2 Bottle CageGrey £12.99 i
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Zefal Pulse B2 Bottle CageBlack £12.99 i
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Zefal Pulse B2 Bottle CagePink £12.99 i
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Zefal Pulse B2 Bottle CageGreen £12.99 i
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Planet X SL Carbon CageMatte 3K Black £14.99 i
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Planet X SL Carbon CageGloss 3K Black £14.99 i
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Planet X SL Carbon CageGloss UD Black £14.99 i
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Selcof Carbon BottlecageBlack and Silver £19.99 i
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Planet X Pro Carbon Bottle CageBlack | Gloss £19.99 i
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Planet X Pro Carbon EVO Bottle CageGloss Black £19.99 i
Select
Selcof Carbon BottlecageBlack £19.99 i
Pedals New bike? Get some new pedals!
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NO THANKS  FREE
Select
Exustar 87x94 Flat PedalSilver £9.99 i
Select
Superstar El Plastique Flat PedalLime £24.99 i
Select
Jobsworth SPD Compatible Pedals Black With Cleat £24.99 i
Select
Jobsworth Dual Sided MTB Pedal Black With Cleat £24.99 i
Select
VP-531 Aluminium Flat Platform PedalsBlack £24.99 i
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Superstar El Plastique Flat PedalWhite £24.99 i
Select
M-Wave MTB Clipless Pedals £29.99 i
Select
Barbieri Shimano SPD MTB PedalsBlack £30.99 i
Select
Exustar E-PM86 MTB Single Sided SPD/Platform Pedals With Sealed BearingBlack £39.99 i
Select
Barbieri Shimano Compatible MTB PedalsBlack/Silver £43.49 i
Select
RSP Engage MTB DH/Trail PedalsBlack £49.99 i
Select
Exustar E-PB525 Flat PedalBlack £59.99 i
Select
Exustar Light Flat PedalBlack £69.99 i

Rest of range

Product Price

£699.99

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