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Build your ultimate trail bike with the Transition Sentinel Alloy Frameset and Öhlins RXF36 M.3 Air 29" Fork bundle. Combining progressive GiddyUp suspension, versatile geometry, and race-proven TTX18 damping.
Build your ultimate trail bike with the Transition Sentinel Alloy Frameset and Öhlins RXF36 M.3 Air 29" Fork bundle. Combining progressive GiddyUp suspension, versatile geometry, and race-proven TTX18 damping.
Transition

Transition Sentinel Alloy MTB Frameset + Ohlins RXF36 M.3 Air TTX18 29in Fork Bundle in Graphite Grey

£2,199.00
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Transition Sentinel Alloy MTB Frameset + Ohlins RXF36 M.3 Air TTX18 29in Fork Bundle in Glacier White
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Your Pre-Order is prioritised (at no additional charge); meaning that as soon as the product arrives with us, we can wrap it straight back up; ready for collection via Click & Collect or despatch to you — it often never even hits the stock room shelves!

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With Pre-Launch, the date when we expect to receive the product ourselves is still a little too hazy to be confident in accepting Pre-Orders.

So, instead, you can submit your email address against the item you are interested in and we will email you as soon as stock arrives on the system.

Estimated Delivery & Collection Dates

Estimated Delivery & Collection Dates are given on Pre-Order and Pre-Launch products. They are for indication purposes only and can change at any time without notice.

The dates we provide are based on indications given by our suppliers. Whenever we get updated information from our suppliers we will endeavour to update the Estimated Delivery & Collection Dates provided on product pages.

We estimate this will be ready for despatch to you or collection via Click & Collect on Undetermined
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In the unlikely event that you are not satisfied with your purchase please feel free to return your items within 90 days of the purchase date for a full exchange or refund. Any item (excluding food, underwear or e-gift vouchers) can be returned to us for any reason within 90 days, provided that the item has not been used or fitted and is returned in its original packaging with valid proof of purchase.

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Online or in-store purchases can be returned to any of our 12 stores free of charge or can be returned by post or courier at your cost after completing the online returns form below. If you are returning an item due to a fault, we will refund your postage costs.

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Items must be returned in their original packaging and unused. Refunds will be issued once the product(s) have been received and inspected.

Click & Collect customers can buy with confidence knowing that they can review the item before deciding whether it is right for you before leaving the store. Should you decide it's not right for you, it can be conveniently exchanged or refunded straight away, or you still have up to 90 days to return it if you are still unsure.

Please note:
1. If the items we have sent you are faulty, damaged or not as we described, we will cover the cost of collection and the delivery of the correct item.

2. If we have delivered the correct bike but upon inspection, you decide the bike is not the one for you, we will charge you £50 for collection (£100 from Northern Ireland). If you do not have the original box in usable condition, we will charge you an additional £15 to provide one.

Refunds will be processed using the same method of payment used for the original purchase. Credit & debit card refunds must be made to the card used for the original purchase.

We are unable to offer a refund without a valid proof of purchase.

Transition Sentinel Alloy MTB Frameset + Ohlins RXF36 M.3 Air TTX18 29in Fork Bundle in Graphite Grey

Season:All Year Round

Brand:Transition

Code:01.25.10.4220-WEB

The Transition Sentinel Alloy MTB Frameset & Öhlins RXF36 M.3 Air Fork Bundle brings together a versatile, confidence-inspiring trail frame and premium suspension technology. Designed for riders who want to climb efficiently and descend aggressively, it's a capable foundation for a custom all-mountain build.

The Sentinel's GiddyUp suspension system delivers 150mm of rear wheel travel, with a progressive leverage curve that balances small-bump sensitivity, mid-stroke support, and big-hit capability. A 64° head angle, size-specific chainstays, and adjustable geometry provide a balanced ride across varied terrain.

Paired with the Öhlins RXF36 M.3 Air fork, featuring race-proven TTX18 damping and a highly adjustable three-chamber air spring, this bundle combines precise steering, excellent traction, and controlled suspension performance for demanding trails.

Key Features & Benefits:

  • Complete Frame & Fork Bundle: Combines the Transition Sentinel Alloy MTB Frameset with the Öhlins RXF36 M.3 Air TTX18 29" Suspension Fork.
  • Progressive GiddyUp Suspension: 150mm rear travel with a 25% progressive leverage curve for efficient climbing, responsive handling, and controlled descending.
  • Versatile Trail Geometry: 64° head angle, size-specific chainstays, and a geometry flip chip for 29" or mixed-wheel configurations.
  • Practical Frame Details: Integrated cable ports, a main pivot mudguard, chainstay protection, and a Fidlock bottle mount.

Full Specification:

Transition Sentinel Alloy Frameset

  • Frame Material: Aluminium Alloy
  • Suspension Design: Transition GiddyUp
  • Rear Travel: 150mm (Compatible with 160mm)
  • Rear Shock Fitment: 205 × 60mm, Trunnion Mount Top / 30 × 8mm Bottom
  • Compatible Rear Shock Stroke: 65mm for 160mm Rear Travel
  • Head Angle: 64°
  • Wheel Compatibility: 29"
  • Geometry Adjustment: Flip Chip
  • Headset: 44mm Zero Stack Upper / 56mm Zero Stack Lower
  • Bottom Bracket: 73mm BSA Threaded
  • Rear Axle: 12 × 148mm
  • Chainline: 52–55mm
  • Rear Brake Mount: 180mm Post Mount
  • Maximum Rear Rotor Size: 223mm
  • Seatpost Diameter: 31.6mm
  • Seat Clamp Diameter: 34.9mm
  • Maximum Chainring Size: 34T
  • Maximum Tyre Size: 29 × 2.5"
  • Chain Guide Mount: ISCG05
  • Bottle Mount: Integrated Fidlock Base
  • Frame Protection: Main Pivot Mudguard and Chainstay Protector

Öhlins RXF36 M.3 Air TTX18 Suspension Fork

  • Wheel Size: 29"
  • Travel Options:160mm
  • Offset: 44mm
  • Damper: Öhlins TTX18
  • Spring: Three-Chamber Air Spring
  • Stanchion Diameter: 36mm
  • Compression Adjustment: 16 Low-Speed and 3 High-Speed Settings
  • Rebound Adjustment: 16 Settings
  • Axle: Floating 15 × 110mm
  • Brake Compatibility: 180–203mm Rotor
  • Construction: Reduced-Friction Chassis with Increased Bushing Overlap
  • Spring Compatibility: Cartridge-Based Air Spring, Convertible to Coil
  • Fork Weight:2,050g Including Axle and Bolts
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