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Planet X


650b Steel Hardtail


The Original 650b Hardcore Hardtail

On-One 45650b 27.5 Hardtail Mountain Bike

The 45650b is a quality steel-framed 'ride-anywhere' hardtail mountain bike. Featuring specific geometry for 650b wheels, handling is more agile than a 29'er, whilst also rolling faster than a 26'er. With the 45650b you really do have the best of both worlds.

A double-butted steel frame gives the 45650b serious strength and durability, as well as smoothing out the rough stuff like only a steelie can. The 45650b can run 4, 5 or 6 inches of front fork travel - hence the name! - which is ideal for speedy flats and descents. We've also included an ISCG mount around the bottom bracket to eliminate chain drop. Nifty!

As a package, the 45650b represents massive grins for your money. Superb groupset options, quality disc wheels and first-class finishing kit combine to give you a bike that's ready for anything.

  • Capable All-Round Hardtail
  • Double Butted Cro-Mo Frameset - Strong & Durable
  • RockShox Front Suspension
  • Quality 650b Disc Wheels
  • Agile Geometry
  • Multiple Groupset & Finishing Kit Options
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The Hardcore Hardtail Updated

Earn Every Descent

The Ride Of Your Life

The 45650b takes on the whole mountain and goes further than you ever imagined. Based on our legendary '456' hardtail geometry, the 45650b adds in 650b wheels to retain nimble and surefooted handling for prowess on the descents, plus adds a lot more speed!

Drive up climbs, skip through singletrack and descend like a demon, that's what's in store with the 45650b. No other hardtail delivers the same rewarding ride characteristics; nothing can match this performance for the same money.

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On-One 45650B Hardtail Frame

Double Butted Durability

Hand Welded

Steel Like No Other

The 45650b features hand-welded DN6 double butted cro-mo tubing. Robust. Quality. There's also an externally butted seat tube to provide maximum support for aggressive riding and help trim the fat. Headtube junctions are beefed up with external gussets for ultimate strength and we've even fitted an ISCG mount for your favourite chain guide / bash guard.

It's steel. it's real. What else would you expect from Sheffield's own bike company?

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Trail Ready Builds

Performance And Comfort

Groupset & Finishing Kit

We know no two cyclists are identical, that's why we offer a range of groupset and finishing kit options. Now you can choose the ideal set up to suit your budget and your heart. Tailor your bike to your exact requirements, with options from the best brands available, such as SRAM, Shimano, Campagnolo, Selcof, FSA, Cinelli, Selle Italia, Fizik, San Marco, Time, Look, Exustar, Continental and Vittoria. The list goes on...

No matter what your tastes, we go the extra mile to ensure you get your dream bike.

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Size & Specs

Bike frame geometry
AHead Angle (°)65.765.765.765.7
BHead Tube Length (mm)


CEffective Top Tube (mm)571592603618
DSeat Angle (°)
ESeat Tube Lenght Centre to Top(mm)355406457508
FChainstay Length (mm)430430430430
GStandover Height (mm)744778805830
HStack (mm)570584592597
IReach (mm)375390397410
If you're unsure about the size you need, please call our customer services team to see if we can help +44 (0)1709 38 66 66

Planet X

45650b range

From £999.99
On One 45650B SRAM NX1 Mountain Bike Customisable Options
On One 45650B SRAM NX1 Mountain Bike

The 45650b NX1 sets new standards for price performance in the hardcore hardtail category. Using exactly the same geometry and double butted cro-mo tubing as its GX1 and XO1 equipped siblings the new mid-wheel-size 45650b X5 is all set to set your local trails alight with you onboard.

  • Double butted, Cro-Mo, DN6 frame tubing
  • SRAM NX1 Groupset, Hydraulic brakes
  • Rockshox Recon Gold RL 120mm Fork
  • On-One Finishing Kit

Hardcore Hardtail Frame

From £149.99
On-One 45650B Frame

The 45650b updates our hardcore, hardtail and supremely capable 456 geometry for the 650b/27.5" wheel size. All the fun of a 26" with the faster rolling action of a 29er- the 45650b is just perfect. If Goldilocks had a bike, it would be this one..