Transition Bikes Product Support for Sentinel Alloy 2024

Sentinel Alloy
YEARS PRODUCED: 2024 - 2025

You may view the exploded frame detail and purchase replacement parts for your frame below. To verify you have the correct frame, please make sure your serial number has the same first 7 characters listed below.

APPLICABLE SERIAL NUMBER RANGES: TBC4233xxx, TBC4234xxx,

	REF #	DESCRIPTION PART # Torque Specs Other Notes	# IN FRAME	STOCK LEVEL	PURCHASE QTY	ADD TO CART	PRICE/EA
	0	Frame Bearing Kit: Trunnion A - Includes All Bearings P/N: 01.25.91.0001	1	All Available			$60.00
	5	MAX Bearing: (6903) - Each P/N: 01.17.91.6903	2	Out of Stock			$11.00
	6	Main Pivot Spacer 17mm x 30mm (TRB-BSP) - Each P/N: 01.19.92.0202	1	All Available			$6.00
	7	Bearing Spacer and Water Shield 17mm x 30mm x 1.5mm (TRB-BWS) - Each P/N: 01.19.92.0003	2	All Available			$3.00
	8	Main Pivot Axle 17mm x 60mm (TRB-MAX) - Each P/N: 01.19.92.0201 Torque Spec - 19nm (Apply Grease To Shaft & Blue Threadlock To Threads)	1	All Available			$18.00
	9	Main Pivot Taper Nut (A6DA-CCP) - Each P/N: 01.18.92.0205 Torque Spec - (Apply Grease To Outer Surface)	1	All Available			$6.00
	10	Main Pivot Spacer (6x10x1T) - Each P/N: 01.18.92.0203	1	All Available			$0.50
	11	Main Pivot Screw (M6-25L-P-S) - Each P/N: 01.18.92.0202 Torque Spec - 10nm (Apply Blue Threadlock)	1	All Available			$1.50
	12	MAX Bearing: (6802) - Each P/N: 01.17.91.6802	4	All Available			$7.00
	13	Bearing Spacer 15mm x 19mm x 2mm (ASEE-LWS) - Each P/N: 01.18.92.0002	2	All Available			$3.00
	14	Bearing Spacer 15mm x 24mm x 2mm V2 (MDYB-SPA) - Each P/N: 01.19.92.0002	4	All Available			$3.00
	15	Chainstay Pivot Axle 15mm x 26mm V2 (TRB-CAX-26L) - Each P/N: 01.19.92.0101 Torque Spec - (Apply Grease To Shaft)	2	All Available			$10.00
	16	Chainstay Pivot Screw 12mm x 15mm V2 (TRB-SNT-15L) - Each P/N: 01.19.92.0102 Torque Spec - 10nm (Apply Blue Threadlock)	2	All Available			$10.00
	17	MAX Bearing: (6902) - Each P/N: 01.17.91.6902	2	All Available			$7.00
	18	Bearing Spacer 15mm x 22mm x 3mm (TEDC-BWS) - Each P/N: 01.18.92.0004	2	All Available			$3.00
	19	C-Clip 28mm (IRTW-28) - Each P/N: 01.20.92.0002	2	All Available			$2.00
	20	Rocker Pivot Screw 8mm x 40mm (MDEA-LBT) - Each P/N: 01.19.92.0303 Torque Spec - (Apply Blue Threadlock)	1	Out of Stock			$1.50
	21	Rocker Pivot Axle 15mm x 38mm (TSCF-LAX) - Each P/N: 01.20.92.0301 Torque Spec - 15nm (Apply Grease To Shaft)	2	All Available			$10.00
	22	MAX Bearing: (3802) - Each P/N: 01.17.91.3802	2	All Available			$14.00
	23	C-Clip 24mm (IRTW-24) - Each P/N: 01.20.92.0001	2	All Available			$2.00
	24	Bearing Spacer 15mm x 19mm x 2.5mm (TSFA-LWS) - Each P/N: 01.18.92.0003	4	Only 1 Available			$3.00
	25	Seatstay Pivot Axle 15mm x 20mm (TRB-CAX-20L) - Each P/N: 01.20.92.0402 Torque Spec - (Apply Grease To Shaft)	2	All Available			$10.00
	26	Seatstay Pivot Screw 12mm x 12mm (TRB-SNT-12L) - Each P/N: 01.20.92.0401 Torque Spec - 12nm (Apply Blue Threadlock)	2	Out of Stock			$10.00
	27	MAX Bearing: (6900) - Each P/N: 01.17.91.6900	2	Out of Stock			$7.00
	28	C-Clip 22mm (IRTW-22) - Each P/N: 01.18.92.0006	22	All Available			$2.00
	29	Trunnion Shock Bolt Washer V2 (TSCF-SCP) - Each P/N: 01.19.92.0508	2	All Available			$5.00
	30	Trunnion Shock Bolt V2 10mm x 24mm (TSC-TRC-24L) - Each P/N: 01.19.92.0506 Torque Spec - 12nm (Apply Blue Threadlock)	2	All Available			$10.00
	31	Trunnion Shock Spacer 10mm x 6mm (TSC-SWS) - Each P/N: 01.18.92.0005	2	All Available			$2.50
	32	Geo Adjust Chip V2 - Left (TSCF-LCP-L2) - Each P/N: 01.22.92.0502	1	All Available			$10.00
	33	Geo Adjust Chip V2 - Right (TSCF-LCP-R2) - Each P/N: 01.22.92.0503	1	All Available			$10.00
	34	Shock Bolt 8mm x 55mm (TRB-BT-55L-S) - Each P/N: 01.21.92.0501 Torque Spec - 10nm (Apply Grease To Shaft & Blue Threadlock To Threads)	1	All Available			$10.00
	35	Cable Holder: 4mm Cable w/ 5mm Brake (AS-CBG) - Includes Plugs P/N: 01.23.92.0601	2	All Available			$5.00
	36	Cable Holder Screw (M3x10L-M-S) P/N: 01.18.92.0605	2	All Available			$1.00
	37	12x148 Rear Axle 2 pcs (Frames w/ UDH) (TRB-HAX A29C-WS) P/N: 01.21.51.0148	1	All Available			$30.00
	38	Rear Axle Collet For TRB-HAX (A29C-WS) - Each P/N: 01.21.51.0149	1	All Available			$8.00
	39	Downtube Protector: DPT-AL-S (VLF-1314) P/N: 01.21.98.1314 Torque Spec - For XS-Small	1	All Available			$16.00
	39	Downtube Protector: DPT-AL-L (VLF-1315) P/N: 01.21.98.1315 Torque Spec - For Med-XXL	1	All Available			$16.00
	40	Seatstay Protector: Alloy Frames (VLF-1313) P/N: 01.21.98.1313	1	All Available			$12.00
	41	Chainstay Protector: Sentinel Alloy (VLF-1761e) P/N: 01.25.98.4316 Torque Spec - For XS	1	All Available			$15.00
	41	Chainstay Protector: Sentinel Alloy (VLF-1760e) P/N: 01.25.98.4315 Torque Spec - For SM - Med	1	All Available			$15.00
	41	Chainstay Protector: Sentinel Alloy (VLF-1759e) P/N: 01.25.98.4317 Torque Spec - For L-XXL	1	All Available			$15.00
	42	Universal Derailleur Hanger (SRAM UDH) P/N: 01.21.93.0001	1	All Available			$15.00
	42	Universal Derailleur Hanger - Aluminum (SRAM UDH) P/N: 01.23.93.0001	1	All Available			$20.00
Total Support Items: 43

REAR TRAVEL:	150mm (Compatible with 160mm)

FRONT TRAVEL:	160mm

WHEEL SIZE:	29" or MX (XS 27.5 only)

SIZES:	XS, SM, MD, LG, XL, XXL

FRAME BEARINGS:	2x 6903, 2x 6902, 4x 6802, 2x 3802, 2x 6900

FORK AXLE TO CROWN:	578mm (Includes headset) (XS 560mm)

FORK OFFSET:	44mm (XS 37mm)

REAR SHOCK SIZE:	205mm x 60mm (compatible with 205 x 65mm)

SHOCK HARDWARE:	Trunnion Mount Top / 30mm x 8mm Bottom

HEADSET (TOP):	44mm Zero Stack

HEADSET (BOTTOM):	56mm Zero Stack

BB SHELL:	73mm BSA Threaded

CHAINLINE:	52-55mm

REAR BRAKE MOUNT:	180mm Post Mount, Max Rotor Size 223mm

REAR AXLE:	Transition Axle For UDH, 12mm x 148mm Spacing

ISCG TABS:	ISCG05

SEATPOST DIAMETER:	31.6mm

SEAT CLAMP:	Carbon: 37.0mm Alloy: 34.9mm

MAX SEATPOST INSERTION:	Carbon: X-Small 245mm \| Small 245mm \| Medium 275mm \| Large 315mm \| X-Large 345mm \| XX-Large 375mm Alloy: X-Small 225mm \| Small 225mm \| Medium 260mm \| Large 310mm \| X-Large 325mm \| XX-Large 340mm

MAX CHAINRING SIZE:	34T Standard Single Ring

MAX TIRE SIZE:	29" x 2.5" (*see FAQ)

REAR SHOCK SAG:	150mm/60mm: 16-20mm (26-32%)

WARRANTY POLICY

At Transition Bikes, we take pride in the quality of our products. Our frames are manufactured to withstand the rigors and abuse modern mountain bike trails can dish out. That said, anything can break given just the right amount of time, wear, or misfortune. Everyone here at Transition Bikes is committed to keeping you riding and we realize every warranty and or crash replacement situation is unique. You have our guarantee that we will do our best to make sure we keep you riding while limiting any downtime.

The V3 Sentinel, released in 2024, is covered for life against manufacturing defects. This policy applies to original owners only. Transition Bikes will repair or replace any original purchaser's individual frame parts or complete frame at our discretion. Due to unavoidable variations in paint batches, production runs, and natural aging (e.g., UV fade), slight differences in color or finish may occur between a replacement part and the original. While we aim for consistency, perfect color matching cannot be guaranteed. These variances are not considered defects and are not covered under warranty.

If you did not purchase the bike directly from us, you must register your frame on our site with your serial number and provide proof of purchase to qualify for a warranty. In the event of an issue with your frame, Transition Bikes will determine whether it qualifies as a ‘Warranty Issue’ or is covered under our ‘Crash Replacement Policy’ (see below for details).

In the event that you have to send back all or part of your frame under warranty, you are responsible for the shipping costs to get it to us, and we will pay the return shipping.

*Our warranty policy does not cover:
Any labor costs associated to the warranty claim.
Modifications from stock configuration.
Normal wear-and-tear damage.
Paint damage caused by the removal of protective tapes or adhesives.
Paint fade and/or damage caused by environmental factors (wind, water, sun, etc.).

CRASH REPLACEMENT

In addition to our warranty, all Transition Bikes frames are covered for life under our “Crash Replacement Policy” to the original or second hand owner. If for any reason you should find yourself with a damaged frame, you may send us the broken frame section, and we will replace it for the best possible price we can, assuming we have the replacement part available. If we do not have the piece available, we will attempt to work out a crash replacement price on a replacement frame set. The customer is responsible for all shipping costs to get the frame to and from Transition Bikes.

WE GET IT, PEOPLE WHO RIDE OUR BIKES RIDE HARD

Above is our official stance, since to some degree these things need to be spelled out. But our entire philosophy is based around being a rider-owned company, and we take that seriously. We're well aware that not every circumstance can be accounted for, and not every case falls neatly into one of the above categories. We look at every warranty and crash replacement case with a fresh lens and treat every situation in the manner in which we would expect it to be handled. Our goal is to leave no rider who supports us without support in return.

WARRANTY/CRASH REPLACEMENT CLAIM FORM

To submit a Warranty/Crash Replacement Claim within the United States or Canada, you must have an account with us. To sign in to your existing account or create a new account, follow this link. Once you are signed in, click on Warranty Claims to submit a claim. Our International Distributors handle warranty cases outside the United States and Canada. Please contact your region's distributor to get a claim started. If you have any other questions regarding our warranty or crash replacement policies, please email us at warranty@transitionbikes.com or call us by phone, at (360) 230-8596.

Can I fit a water bottle on my Sentinel?

Sure!

Fidlock 450ml - All Sizes
Fidlock 590ml - SM through XXL
Fidlock 750ml compact - MD through XXL
Standard 22oz - MD through XXL
Standard 26oz - LG through XXL

Support File

Can I remove or substitute any parts when I buy a frame or complete bike?

We are not able to remove, substitute or modify any parts included with a frame or complete bike. All parts specified will be included with your purchase.

Can I run a coil shock on this bike?

Yes. This bike is designed to work with both air and coil shocks. We know there are a lot of great shock options outside of what we spec, but we have worked extremely hard to develop the tune in our supplied shocks. We believe they perform as good as anything else available in the aftermarket options.

Transition Bikes is not responsible for any damage to a frame caused by a shock that we do not spec. To verify shock fitment please email us at info@transitionbikes.com.

Can I run full-29 in the "high" setting / mixed wheels in the "low" setting?

The primary purpose of the Sentinel V3 flip-chip is to adjust the geometry depending on rear wheel size (Low = 29", High = 27.5"). We don't recommend straying from this, but there's nothing to stop you!

Can I try a bike before I buy?

We offer three ways to demo a bike. If you find yourself in Bellingham, you can follow this link to schedule a demo through the Outpost. If you live somewhere else, you can follow this link to see what shops currently have demo bikes available. And finally, you can view our events page, located here to see which upcoming demo events we'll be participating in.

Do both the carbon and alloy versions feature frame storage?

No, only the V3 Sentinel Carbon has the BOOM Box.

Do you offer financing?

We provide easy and affordable financing through our partner, Bread, so you can pay for your purchase over time. This option is only available in the USA at this time.

How do I find tracking for my shipment?

If you have not received an email confirming your tracking number, you can find it by going to your "Order History" once logged in. There you'll see the invoice number, date shipped, shipping carrier, and tracking info, if available. You'll be able to click on the tracking info and be re-directed to the shipping carrier's website.
Support File

How do I get warranty support / order support parts outside of North America?

You'll need to contact your nearest dealer or distributor - they can be found on our dealer map

I want to run a coil shock, do you have a spring rate recommendation?

We do not have a spring rate chart or recommendation for this model. Please reach out to the shock manufacturer or use the spring rate calculator at TF Tuned which may be found here tftuned.com.

What is the maximum rear tire size?

We list a guideline tire size for each frame, but the real answer is: it depends. Tire brand, tread pattern, rim width, conditions, and how aggressively you ride all play a role. Wider rims can make tires measure larger, and there’s variability between sizes and manufacturers (not all 29” x 2.4” tires are created equal).

If you ride in mud, you'll need extra clearance to avoid packing up. If you push the bike hard, you could flex the rear wheel enough to cause tire rub on the rear triangle—even if you think you’ve got plenty of clearance.

So, what's the takeaway? Please use common sense. If your wheel is properly dished, trued, and tensioned and your tire is rubbing hard enough to damage the frame, you’re probably running too big of a tire.

What is the warranty policy for this model?

This frameset is covered for life against manufacturing defects for the original owner and comes with a lifetime crash replacement policy. You can read more about our warranty and crash replacement policy on our Support Page.

What size do I need?

Looking for a little giddy-up in your life, but not sure what size you need? Take a look at our human specific sizing guide located here.

Will installing frame protection affect the warranty?

Installing frame protection will not affect your warranty, but we do caution against installing it on neon or brightly-colored models as these paints are more susceptible to discoloration and fading. Paint fade is not covered under our factory warranty.