Set Currency:
Your Basket - 0 Items - £0.00 Checkout

Planet X Jack Flash 29er SRAM SX Mountain Bike

CBPXJFSX

£799.99
Planet X Jack Flash 29er SRAM SX Mountain Bike Planet X Jack Flash 29er SRAM SX Mountain Bike
  •  
  •  
  •  
  •  
  •  
1 Review
Planet X Logo

Retro styling with modern geometry. The 29er Jack Flash keeps the looks of it's 26 inch dirt jumping cousin but rolled out into a progressive trail hardtail package.

We've 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
From £799.99
FINANCE From £22.42/mth* More info
Bikes in stock built within 5 - 7 days

Size guide and geometry

Description

What happens when you take the Iconic Planet X Jack Flash Frame but update it for a modern crowd? We've 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)

Pedals not included? Why not?

Pedal choice is a personal thing. Most higher end bikes are expected to be ridden with clipless pedals. These are matched to cleats on the underside of your cycling shoes. There are a few standards of these, and most cyclists tend to stick with one standard across all their bikes. So, you don't need to buy multiple pairs of shoes! Thats why Planet X don't sell bikes with pedals included. If you wish to add pedals to your order, simply select an option from the drop-down menu.

NOTE: Please make sure you check the size guide to order the correct size of this frame.

How do I unbox and set up my bike when it arrives

Please Note: - Bike Specifications can and do change from time to time from the specification pictured above. Please check the Full bike specification cartefully before ordering

Sizing Guide

Rider HeightSuggested Frame Size
5'7" - 5'11"Medium 
5'10" - 6'1"Large 
6' = 6'4"X-Large 

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.

Bike frame geometry
   MED" LRG"XLG"
-Rider Height5'7" - 5'11"5'10" - 6'1"6' - 6'4"
AHead Angle (degrees)65.065.065.0
B Head Tube (mm)100120135
C Top Tube Effective(mm)600639.4657.2
D Seat Tube Angle (degrees)757575
E Seat Tube C-T Actual (mm)420460500
F Chainstays (mm)445445445
G BB Drop (mm)585858
I Stack (mm)609628641
J Reach (mm)440460480
K Front Centre (mm)752783809
M Fork Offset (mm)515151
O Wheelbase (mm)11911222.21248.6

Standard Bike Specification

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 Grip / Black
  Saddle San Marco Monza Start Saddle / Black / Carbon Steel
  Chain KMC X12 12 Speed Chain / 126 / Silver/Black
  Stem On-One Hot Box V2 Stem / 50mm / 7 Degree / 31.8mm
  Brake SRAM Level Hydraulic Disc Brake / Rear / 1600mm / 20 Post to IS
  Brake SRAM Level Hydraulic Disc Brake / Front / 900mm / Post Mount 20mm Spacers
  Tyre Panaracer FireSport 29" Wire Bead Tyre / 2.35"
  Handle Bar On-One Enduro6 Riser Handlebar / 780mm
  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 Alex EXR30 29er on Formula 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 Clarks CL Rotors / Silver / 160mm
  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 Tyre2.4"
Mudguard mountsNA
Rack MountsNA
Bottle Cage Bosses1x
Brake TypeDISC POST
Bottom BracketBSA 73mm 
Headset TypeSelcof Zero Stack : Tapered / ZS44/28.6 IS56/40 
Fork Length (mm)530
Cable RoutingINT/EXT
Dropper CompatibleStealth
 

Size

Geometry

Sizing Guide

Rider HeightSuggested Frame Size
5'7" - 5'11"Medium 
5'10" - 6'1"Large 
6' = 6'4"X-Large 

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.

Customise this Bike

Build your bike in 3 simple steps

  1. Select your size and colour
  2. Choose your components
  3. Buy your custom bike

Step 1

Select size and colour by choosing below View size guide
Large Satin Black Large Satin Black £799.99
Large Gloss Burnt Orange Large Gloss Burnt Orange £799.99
X Large Satin Black X Large Satin Black £799.99

Step 2: Choose Components

Brake 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
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 £200.00 i

Step 2: Optional Accessories

Bottle Cage
Select
NO THANKS  FREE
Select
Zefal Aluplast 124 Bottle CageSilver £3.99 i
Select
Planet X Alloy Bottle CageSIlver £3.99 i
Select
Planet X Alloy Bottle CageBlack £3.99 i
Select
Zefal Aluplast 122 Bottle CageWhite £4.99 i
Select
Planet X Nightwolf Plastic Bottle CageBlack £4.99 i
Select
Planet X Bi Plastic Bottle CageBlack £4.99 i
Select
Zefal Aluplast 122 Bottle CageSilver £4.99 i
Select
Planet X Ambi Plastic Bottle CageBlack £4.99 i
Select
Planet X Fang Plastic Bottle CageBlack £5.99 i
Select
Zefal Pulse B2 Bottle CagePink £9.99 i
Select
Zefal Pulse B2 Bottle CageGreen £9.99 i
Select
Zefal Pulse B2 Bottle CageOrange £9.99 i
Select
Zefal Pulse B2 Bottle CageCyan Blue £9.99 i
Select
Zefal Pulse B2 Bottle CageWhite £9.99 i
Select
Zefal Pulse B2 Bottle CageNeon Yellow £9.99 i
Select
Zefal Pulse B2 Bottle CageBlue £9.99 i
Select
Zefal Pulse B2 Bottle CageRed £9.99 i
Select
Zefal Pulse B2 Bottle CageGrey £9.99 i
Select
Zefal Pulse L2 Bottle CageBlack £12.99 i
Select
Planet X SL Carbon CageMatte 3K Black £14.99 i
Select
Planet X Stainless Steel Bottle CageBrushed £14.99 i
Select
Planet X Pro Carbon Bottle CageBlack | Gloss £19.99 i
Select
Planet X Pro Carbon EVO Bottle CageMatt Black £19.99 i
Select
Planet X Pro Carbon EVO Bottle CageGloss Black £19.99 i
Select
Planet X Pro Carbon Bottle CageBlack | Matt £19.99 i
Pedals
Select
NO THANKS  FREE
Select
Exustar 87x94 Flat PedalSilver £9.99 i
Select
M-Wave MTB Clipless Pedals £29.99 i
Select
El Guapo Toro Flat PedalBlack £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

Custom Bike Specification

Planet X Jack Flash 29er SRAM SX Mountain Bike CBPXJFSX

Colour
Frame Size
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 Grip / Black
Saddle San Marco Monza Start Saddle / Black / Carbon Steel
Chain KMC X12 12 Speed Chain / 126 / Silver/Black
Stem On-One Hot Box V2 Stem / 50mm / 7 Degree / 31.8mm
Brake SRAM Level Hydraulic Disc Brake / Rear / 1600mm / 20 Post to IS
Brake SRAM Level Hydraulic Disc Brake / Front / 900mm / Post Mount 20mm Spacers
Tyre Panaracer FireSport 29" Wire Bead Tyre / 2.35"
Handle Bar On-One Enduro6 Riser Handlebar / 780mm
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 Alex EXR30 29er on Formula Boost 6 Bolt Wheelset / Shimano 11 Speed
Fork Rockshox Judy Silver TK 29" Boost Fork / 130mm / 15x110mm / Gloss Black / Crown Adjust

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.

Rest of range

Product Price

£799.99

1. Select Finance Period

2. Change Deposit


Drag Slider to change deposit

3. Finance Details

Deposit
12 Monthly Payments
Interest Rate
Total Payable
Back to top