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Send-it-all on the new Sentinel
Send-it-all on the new Sentinel
Transition

Transition Sentinel Alloy MTB Complete Bike In Purple

£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.

Hassle free returns

Returns and exchanges

If you are not completely satisfied with your purchase, simply return your item(s) unused and in original condition, as you received it, within 30-days from the date of purchase, as per 30 day right to reject faulty goods under the Consumer Rights Act 2015.

Returns can take 3 to 5 days to process. You must notify us in writing within 14 working days of placing your order, by post or email of your intention to do this, as per 14 day right to cancel under the Consumer Contracts Regulations 2014.

Please note, customers in Northern Ireland, may incur a returns fee.

For any queries with returning items please contact the
returns department or call 0580765612

Returns Address

Rmcycles Ltd

Returns Department

Unit 3A, Leigh Green Industrial Estate

Appledore Road, Tenterden

Kent, TN30 7DE


We will issue a refund, credit or exchange the item for a different size / colour if preferred. Delivery charges are only refundable if you have cancelled your entire order within the 7 day Cooling-Off Period or where the goods are faulty( or we send you the wrong item) and a refund is made.We cannot assume responsibility for returned items that are lost in the post. Your statutory rights are not affected.

Store Credit is valid for 2 years and cannot be redeemed for cash at any point.

      • All Item(s) will be inspected upon return
      • Item(s) can be tried on for sizing but not worn for activity - Please do not wear items next to the skin and that ensure that you are not wearing perfume / aftershave or a deodorant when trying on for hygiene reasons and to maintain the condition of the product.Shorts MUST be tried on with clean underwear. Item(s) must be returned with all original packaging intact and tags attached. Item(s) returned with incomplete or damaged packaging or missing or unattached tags may be refused or subject to a restocking fee
      • In the unlikely event that an item is returned to us in an unsuitable condition, we may have to send it back to you
      • Item(s) returned as unused/unworn, that have clearly been worn, washed or heat moulded will be refused
      • Item(s) returned without a returns form fully completed could delay the process of your return
      • All neoprene products (wetsuits etc.) are fully inspected prior to despatch. We cannot accept returns on wetsuits damaged in the process of trying on.
      • Do not apply the returns label to the original packaging. Please use a box or parcel bag to package the item rather than applying the label to the item's packaging
      • We will not be able to return shoes that have been heat-moulded. RM Cycles cannot be held accountable for improper heat moulding
      • For health and safety reasons face masks cannot be returned for an exchange or refund
      • We reserve the right to refuse this free service on a case by case basis
      • Please retain your proof of postage
      • If you pay for a delivery service, we will not refund the delivery cost unless the item is faulty or the incorrect item has been sent to you
      • In the case of partial returns, Rmcycles reserves the right to void any discounts and the customer will be liable to pay the full listed price advertised online
      • We do not offer an exchange programme at this time, please place a new order

Faulty Item

If the item you received is faulty, please contact us quoting your order number, your name and address, details of the product and the reason for return, and whether you require a refund or a replacement. We will then advise on how to proceed with the return. You have 30 days from receipt of the faulty item to notify us of your intent to return it and a further 30 days in which to do so.

Incorrect Item

If the item you received is not what you had ordered, please contact us quoting your order number, your name and address, details of the product and the reason for return, and whether you require a refund or a replacement. We will then advise on how to proceed with the return.

All refunds will be given as soon as possible, and usually take the form of a refund transaction onto the card used for the original purchase. At the very latest we will refund your money within 28 days from the day we receive your returned item. In the case of incorrect ordering and undisclosed reasons for return, a credit or exchange may be issued and the customer will be expected to pay the return postage costs.

All returns must be accompanied by a completed returns form and a copy of the original invoice.

Dimension of returns

Fill in a Returns Form, including all relevant information, as an incomplete form will delay the processing of your return. Include this form with the item and package up securely. Do not affix the postage label to the product packaging, shoe boxes etc. We strongly recommend you use a service that provides a certificate of postage and a tracking number.

For UK residents, our returns policy does not cover bikes, bike boxes, turbo trainers, trainer mats, indoor bikes, wheels, workstands or anything larger than 61cm L x 46cm W x 46cm D. If you are unsure about the size of an item please contact Customer Care prior to your order being dispatched. A charge will apply to return these items to us. Bikes or bike boxes: £35. Indoor bikes: £100. Turbo trainers, trainer mats, wheels, workstands and any item (excluding previously mentioned) over 61cm L x 46cm W x 46cm D:£15. This fee will be waived if your item is faulty or in the unlikely case that you've received the wrong product.

If you are returning a larger item as described above,you will need to contact us with the following details to arrange a collection:

      • Your full name and collection address including postcode
      • Order number and confirmation of which product(s) is/are coming back to us
      • Your preferred date of collection (Monday to Friday only)
      • A contact number in case the courier needs to get in touch with you

Should you have any questions please call us on 01580765612. Due to high call volumes, there may be a delay in answering. Alternatively, Please send us a email to customercare@rmcycles.co.uk

Transition Sentinel Alloy MTB Complete Bike In Purple

Season:2025

Brand:Transition

Code:TR.CB.25.SENT.ALPUR

Send-it-all on the new sentinel

a bike tht 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 leavest he sentinel right in the sweet spot, as we like to call it. It's versatile attitude helps riders excel and push heir limits, making it the "one bike" most will need. Its intuitive nature makes it easy to ge acquainted with; you'll find yourself sending lines, jumps, and maneuvers you always felt were beyond your ability. Where before you went around, now you go over. Where you pushed up, now you pedal. Where your 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 th frame with update industrial design, features and geometry to turn ut 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 crates a bike tht encourages new riders tyo 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 is fidlock 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 mud guard.
  • 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 setup. 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 pedaling 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 suite 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 plowing. Wherever you end up, you can focus on the trail without remotes, levers or knobs. Just grab your bike and giddyup

xs
27.5"
sm
29"/mx
md
29"/mx
lg
29"/mx
xl
29"/mx
xxl
29"/mx
a. Reach415mm430mm / 426mm455mm / 451mm480mm / 476mm505mm / 501mm530mm / 526mm
b. Stack592mm615mm / 618mm621mm / 624mm633mm / 636mm642mm / 646mm651mm / 655mm
c. Carbon effective tt length527mm549mm577mm605mm632mm660mm
c. Alloy effective tt length534mm557mm586mm614mm642mm670mm
d. Seat tube length360mm360mm390mm430mm460mm490mm
e. Carbon effective st angle79.879.3 / 78.978.7 / 78.378.3 / 77.977.9 / 77.577.6 / 77.2
e. Alloy effective st angle79.278.7 / 78.277.9 / 77.577.3 / 76.976.8 / 76.476.5 / 76.2
saddle height for effective st angle560mm600mm660mm720mm780mm820mm
carbon seat tube offset at bb69mm69mm69mm69mm69mm69mm
alloy seat tube offset at bb87mm87mm87mm87mm87mm87mm
f. Head tube length100mm100mm110mm120mm130mm140mm
g. Head tube angle6464 / 63.664 / 63.664 / 63.664 / 63.664 / 63.6
h. Carbon chainstay length436mm442mm / 440mm442mm / 440mm446mm / 444mm446mm / 444mm446mm / 444mm
h. Alloy chainstay length434mm442mm442mm446mm446mm446mm
i. Carbon wheelbase1173mm1208mm1237mm1273mm1302mm1332mm
i. Alloy wheelbase1171mm1208mm1237mm1271mm1300mm1330mm
j. Bottom bracket drop15mm25mm / 11mm25mm / 11mm25mm / 11mm25mm / 11mm25mm / 11mm
k. Estimated bb height340mm350mm / 344mm350mm / 344mm350mm / 344mm350mm / 344mm350mm / 344mm
Technical Information
  • Frame
    Sentinel Alloy 150mm
  • Wheel Size
    29" (X-Small 27.5")
  • Rear Shock
    RockShox SuperDeluxe Base (205x60mm)
  • Fork
    RockShox Psylo Gold RC (160mm)
  • Headset
    FSA No.57E
  • Stem
    RaceFace Aeffect R (40mm)
  • Handlebar
    RaceFace Chester XS/SM (800x20mm) MD/LG/XL/XXL (800x35mm)
  • Grips
    ODI Elite Flow Lock-On
  • Saddle
    SDG Bel Air 3
  • Seatpost
    SDG Tellis XS (125mm) SM (150mm) MD (170mm) LG (200mm) XL/XXL (230mm)
  • Brakes
    Shimano Deore M6120 4 Piston
  • Rotors
    Shimano RT66 (203mm)
  • Shifter
    Shimano Deore M6100 iSpec EV
  • Derailleur
    Shimano Deore M6100 SGS 12sp
  • Cassette
    Shimano Deore M6100 (10-51t)
  • Chain
    Shimano Deore M6100
  • Crank
    Shimano Deore M6100 (30T/165mm)
  • Rims
    WTB ST i30
  • Spokes
    Pillar Double Butted
  • Hubs
    Novatech D791SB/D902SB
  • Tyre/Front
    Maxxis Assegai 3C EXO/TR (2.5)
  • Tyre/Rear
    Maxxis Minion DHRII 3C EXO/TR (2.4)
  • Included
    Fidlock Twist Bike Base Tubeless Valves & Sealant
  • Weight
    36.4 lbs/16.51 kg (Size MD)
Sizing Information
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