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The Sentinel rides the lines between planted bottomless sender and playful, poppy trail pony.
The Sentinel rides the lines between planted bottomless sender and playful, poppy trail pony.
Transition

Transition Sentinel Alloy Deore Mountain Bike 2025 Glacier White

£3,499.00
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Pre-Order

With Pre-Order, you can purchase the latest items added to our store in advance of them arriving with us.

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!

Pre-Launch

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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When you purchase this item, you will earn of rewards points to spend on your next purchase from us. You can spend your Rewards balance in-store & online.

Not happy with your purchase? Send it back to us or return in any of our stores and we will give you a full refund or exchange!

Returns

In the unlikely event that you are dissatisfied with your purchase please feel free to return your goods within 60 days of the purchase date for a full exchange or refund. Any item (excluding food and underwear) can be returned to us for any reason provided it is returned in ‘showroom condition’, with its original packaging, tags and a valid receipt/delivery note.

Simply box up your items for return, include a cover note with the word REFUND or EXCHANGE inside & follow the below steps for safe return to our warehouse; where your return will be processed promptly.

Return Items by Post

It is your responsibility to ensure that the item is returned to us in a safe and secure manner, and in the event of a refund or exchange, in saleable condition (in original packaging and including all warranty, cards, manuals and accessories).

Customers are accountable for return shipping charges.

  1. You should always keep proof of postage and we advise you to use a ‘signed for service’ when returning goods.
  2. Send your package using a recorded delivery method (always keep a copy of your receipt!) to the following address:

Leisure Lakes Bikes Returns,
Unit 1 Osprey Place
Titan Way,
Leyland,
PR26 7EW

Checkout by Amazon Returns

If you used the pay by Amazon option when checking out then please send your package using a recorded delivery method (always keep a copy of your receipt!) with a note inside stating whether you want an exchange (what you want it exchanging for) or refund, to the following address:

Leisure Lakes Bikes Returns,
Unit 1 Osprey Place
Titan Way,
Leyland,
PR26 7EW

Bike & Bulky Item Returns

If you wish to return your bike to us please keep it in the box it arrived in and call us on 01772 644340 and we will arrange a collection.

Please note the following:

  • a) If we have sent you the incorrect bicycle, we will cover the cost of collection and delivery of the correct model.
  • b) If we have delivered the bicycle you ordered, but upon inspection you decide it is not the bike for you, we will charge you £50.00 for the collection.

Please do not ride the bike as a full refund cannot be given if the bike has been used or damaged.

Return Items to a store

Any item (excluding food and underwear) can be returned to any Leisure Lakes Bikes store not just the one you made your purchase at, including those made online. The item must be returned in ‘showroom condition’, with its original packaging, tags and with a valid receipt/delivery note.

Wrong size or you don't like the item?

If returning items that are not suitable for either refund or exchange you are accountable for the delivery cost in returning it to us. You should always keep proof of postage and we advise you to use a ‘signed for service’ when returning goods.

New faulty items/ Wrong Item Received

If you have received items that are faulty or not what you ordered send them back to us (using the steps above) and we will cover the delivery cost of the return if it is within 14 days of delivery. If we have supplied the correct product, it is not faulty or it is outside of the 14 days we can not be liable for your postage charges. You should always keep proof of postage and we advise you to use a ‘signed for service’ when returning goods.

In the event that you have received items that are fault or not what you ordered, please send them back to us as soon as possible. Only in these cases will we cover the cost of the return shipping charges.

Faulty Items

If you have received items that are faulty please send them back to us using the steps above. Please include a covering letter describing the fault and if you would like the item replacing or refunding. Once the item arrives back at our Mail Order Centre you will receive an email notifying you about the progress. Faulty items are then forwarded onto the suppliers to confirm the warranty issue. Please be patient with us as we need to receive this confirmation from the suppliers before we can process your request for a replacement/refund.

When returning the item please use Royal Mail1stClass Recorded* so that you have a tracking reference just in case! If your item arrived faulty we will refund your postage cost. If the item was in full working order at the time of delivery to you, we can not refund your return postage cost.

*In the event that you return a faulty/incorrect item we will refund your postage charge as long as it is 1stClass Recorded or a lesser value service. We do not refund premium services.

Refunds

Refunds will be processed using the same method of payment used for the original purchase. Credit and debit card refunds must be made to the card used for the original transaction, cheque payments will be refunded in cash but due to banking restrictions can only be refunded at least 14 days after the original purchase date. Due to the high incidence of fraud we regret that we are unable to offer any refund without a valid receipt/delivery note.

Refunds will be made for faulty or incorrect items, including any delivery charge incurred by the buyer (excluding ‘Special Delivery’) in the return of the item. If the products you ordered are delivered to you in good condition but you wish to return them for any reason we will refund the full value of the goods excluding any carriage charge upon receipt of your returned goods.

Items won’t be considered lost until after 15 working days of items beingdispatched. Once the 15 working days are up we will issue a refund or replacement.

Not received your order?

If you have not received your order please call us on 01772 644340 and a member of staff can confirm the shipping date. Unfortunately we cannot consider an item to be lost until 15 working days has passed (according to Royal Mail procedure). Once the 15 working days have passed we will be able to issue a full refund or resend your order.

Transition Sentinel Alloy Deore Mountain Bike 2025 Glacier White

Season:2025

Brand:Transition

Code:25TR-SENT ALY Deore-WHT

Transition Sentinel Alloy Deore Mountain Bike

A bike that says yes to every trail, every ride and begs for more.

The Sentinel rides the lines between planted bottomless sender and playful, poppy trail pony. This leaves the Sentinel right in the sweet spot, as we like to call it. Its versatile attitude helps riders excel and push their limits, making it the "one bike" most will need.

Its intuitive nature makes it easy to get acquainted with; you'll find yourself sending lines, jumps, and manoeuvres you always felt were beyond your ability. Where before you went around, now you go over. Where you pushed up, now you pedal. Where you rolled, now you boost. It's time to Send-It-All!

Refining the Legend

The new Sentinel may have a similar silhouette, but we've fully redesigned the frame with updated industrial design, features and geometry to turn it up a notch. The leverage curve supports the bike higher in its travel, keeping it quick, nimble and light on its feet while leaving plenty of room for big hits. This gives it the lively, sporty attitude felt in the Spur and Smuggler without sacrificing its capabilities in rougher terrain. New size-specific chainstays and a 64° headtube angle keep riders balanced with great traction on climbs and descents. All of this creates a bike that encourages new riders to push their limits while ensuring a seasoned pro feels none.

Refined Details

We added internal frame storage in the downtube of our carbon frame. The BOOM Box (Burritos Or Other Munchies) is positioned below and isolated from the water-bottle cage mount. This allows you to leave your bottle installed in your cage while easily getting into the BOOM Box, reducing clutter and fuss on the trail. It also prevents noise and potential failure since it doesn't place any weight on the door itself. With an easy access lever and two supplied gear bags, riders can stow away snacks, tools, a tube, or anything else they want to have along for the ride.

Geo Adjust Flip Chip: the lower shock mount has a geo-adjust flip chip to accommodate mixed wheels and features a new design that allows water, dirt and debris to easily wash away.

Mud Guard: the Sentinel comes with a pre-installed mudguard to protect the main pivot area, improving the bearing life.

Chainstay Protector: an all-new chainstay protector minimizes chain slap, so you can enjoy the sound of your favourite turns.

Cable ports on the side of the headtube allow for easy and simple cable routing with customizable options for mechanical or wireless shifting as well as left or right rear brake setups. The new port stops cables from getting kinked during a crash and holds them tight to prevent rattling. If you aren't using the port at all, simply cover it with the supplied insert to prevent dirt or water from getting inside your frame and keep a clean aesthetic. These ports help improve the looks of the frame while remaining functional and simple for maintenance.

Fidlock Ready

The new Sentinel isFidlock Ready. We know water bottle capacity is a priority on every bike and can be tricky on smaller sizes. To give you the most options on all sizes, every Sentinel will come with a Fidlock base installed. Fidlock bottles give you more volume for water in a smaller space, allowing for a fidlock 450ml bottle on our XS frame, up to 590ml on SM, and up to 750ml on M-XXL.

  • 29" Wheels S-XXL and mixed wheel compatible, dual 27.5 on XS.
  • 160mm travel front, 150mm travel rear (up to 160).
  • BOOM Box in frame storage with supplied frame storage bags on carbon models.
  • 64° headtube angle.
  • Size-specific chainstays (XS 436, SM/MD 442, LG/XL/XXL 448).
  • Increased size range (XS-XXL).
  • Main pivot mudguard.
  • Carbon and aluminium frame options.
  • Available in 3 colors.
  • New cable routing ports.
  • Refined kinematics create a lively, progressive platform.

Carbon and Aluminium Frame Options

We want everyone to have the bike of their dreams, so we are offering the Sentinel in both carbon and aluminium. To make this bike as accessible as possible, we crafted the aluminium frame to remain simple, keeping costs and weight to a minimum. This means it does not have the BOOM Box, but does still have the flip chip and all other features found on the carbon frame. The aluminium frame is available with two build kits, Shimano Deore and XT, as well as frame only. The carbon frame is available in three build levels, Shimano Deore, XT, and SRAM X0 AXS as well as frame only. Each carbon build has the same high-quality carbon construction including the BOOM Box and frame bags.

GiddyUp Suspension Design

We want to make it as easy as possible to experience great rear suspension performance. The GiddyUp suspension system is designed to behave intuitively across a broad range of setups. Because we get it, sometimes you just want to grab your bike and GiddyUp, without checking your setup. When you do, it will always feel good.

We did this by balancing a 25% progressive leverage curve with a consistent linear rate of change. Anti-squat is tuned to enhance pedalling performance and acceleration. Overall chain growth is moderate and reduces after sag so chain tension doesn't get in the way of the suspension working.

This translates to killer small bump compliance and great mid-stroke support that gradually transitions into an end-of-stroke ramp that is subtle, yet supportive. The amount of consistent progression is carefully optimized for both air and coil shocks. Riders are able to add or remove volume spacers in air shocks to suit their individual riding style and there is no compromise to bottom-out support with coil shocks. The Sentinel has 150mm of rear wheel travel when used with the supplied 205mm x 62.5mm stroke shock. It is also possible to install a shorter, 205mm x 57.5mm stroke shock, to decrease the rear wheel travel to 140mm.

A wide usable sag range of 25 - 35% allows the rider to tune the feel of the bike; from poppy and playful to planted for ploughing. Wherever you end up, you can focus on the trail without remotes, levers or knobs. Just grab your bike and GiddyUp.

Technical Information

Specifications

Alloy Deore
FrameSentinel Alloy 150mm
Wheel Size29" (X-Small 27.5")
Rear ShockRockShox SuperDeluxe Base
(205x60mm)
ForkRockShox Psylo Gold RC
(160mm)
HeadsetFSA No.57E
StemRaceFace Aeffect R (40mm)
HandlebarRaceFace Chester
XS/SM (800x20mm)
MD/LG/XL/XXL (800x35mm)
GripsODI Elite Flow Lock-On
SaddleSDG Bel Air 3
SeatpostSDG Tellis
XS (125mm)
SM (150mm)
MD (170mm)
LG (200mm)
XL/XXL (230mm)
BrakesShimano Deore M6120 4 Piston
RotorsShimano RT66 (203mm)
ShifterShimano Deore M6100 iSpec EV
DerailleurShimano Deore M6100 SGS 12sp
CassetteShimano Deore M6100 (10-51t)
ChainShimano Deore M6100
CrankShimano Deore M6100
(30T/165mm)
RimsWTB ST i30
SpokesPillar Double Butted
HubsNovatech D791SB/D902SB
Tyre/FrontMaxxis Assegai 3C EXO/TR (2.5)
Tyre/RearMaxxis Minion DHRII 3C EXO/TR (2.4)
IncludedFidlock Twist Bike Base
Tubeless Valves & Sealant
Weight36.4 lbs/16.51 kg (Size MD)
Sizing Information
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