Transition Bikes Product Support for Sentinel Alloy 2021

Sentinel Alloy
YEARS PRODUCED: 2021 - 2024

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: TBC4217xxx, TBC4218xxx, TBC4219xxx, TBC4220xxx, TBC4221xxx, TBC4222xxx, TBC4223xxx, TBC4224xxx, TBC4225xxx, TBC4226xxx, TBC4227xxx, TBC4228xxx, TBC4229xxx, TBC4230xxx, TBC4231xxx,

	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	Out of Stock			$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	Out of Stock			$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	Out of Stock			$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	Out of Stock			$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	All 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	2	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	Shock Bolt 8mm x 36mm (TRB-BT-36L-S) - Each P/N: 01.18.92.0509 Torque Spec - 10nm (Apply Grease To Shaft)	1	All Available			$10.00
	33	Shock Screw (TR10-M6-S) - Each P/N: 01.25.98.4340 Torque Spec - 10nm (Apply Blue Threadlock)	1	All Available			$5.00
	34	Cable Holder: 4mm Left (TSC-CPA-L) P/N: 01.18.92.0602	2	Out of Stock			$3.00
	35	Cable Holder: 4mm Right (TSC-CPA-R) P/N: 01.18.92.0601	2	Out of Stock			$3.00
	36	Cable Holder: 5mm Left (TSC-CPB-L) P/N: 01.18.92.0604	1	All Available			$3.00
	37	Cable Holder: 5mm Right (TSC-CPB-R) P/N: 01.18.92.0603	1	All Available			$3.00
	38	Cable Holder Screw (M3x10L-M-S) P/N: 01.18.92.0605	2	Out of Stock			$1.00
	39	12x148 Rear Axle 2 pcs (Frames w/ UDH) (TRB-HAX A29C-WS) P/N: 01.21.51.0148 Torque Spec - 10-12nm Includes A29C-WS (Apply Grease To Shaft & Threads)	1	All Available			$30.00
	40	Rear Axle Collet For TRB-HAX (A29C-WS) - Each P/N: 01.21.51.0149 Torque Spec - Collet Section Only - No Axle Included	1	All Available			$8.00
	41	Downtube Protector: DPT-AL-S (VLF-1314) P/N: 01.21.98.1314 Torque Spec - Size SM Frame Only	1	All Available			$16.00
	41	Downtube Protector: DPT-AL-L (VLF-1315) P/N: 01.21.98.1315 Torque Spec - For Sizes MD-XXL	1	All Available			$16.00
	42	Seatstay Protector: Alloy Frames (VLF-1313) P/N: 01.21.98.1313	1	All Available			$12.00
	43	Chainstay Protector: Sentinel Alloy (VLF-1308) P/N: 01.21.98.4201	1	All Available			$16.00
	44	Cable Holder: 4mm (TSCF-SPC) P/N: 01.21.92.0606	1	All Available			$5.00
	45	Cable Holder Screw (M5x16L-M-SB) P/N: 01.21.92.0607 Torque Spec - 3nm (Apply Blue Threadlock)	1	All Available			$1.50
	46	Universal Derailleur Hanger (SRAM UDH) P/N: 01.21.93.0001	1	All Available			$15.00
	46	Universal Derailleur Hanger - Aluminum (SRAM UDH) P/N: 01.23.93.0001	1	Out of Stock			$20.00
Total Support Items: 45

REAR TRAVEL:	150mm (Compatible with 140mm)

FRONT TRAVEL:	160mm

WHEEL SIZE:	29"

SIZES:	SM, MD, LG, XL, XXL

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

FORK AXLE TO CROWN:	574mm (Includes headset)

FORK OFFSET:	42-44mm

REAR SHOCK SIZE:	205mm x 62.5mm (Compatible with 205mm x 57.5mm)

SHOCK HARDWARE:	Trunnion Mount Top / 25mm x 8mm Bottom

HEADSET (TOP):	44mm Zero Stack

HEADSET (BOTTOM):	56mm Zero Stack

BB SHELL:	73mm BSA Threaded

CHAINLINE:	52mm

REAR BRAKE MOUNT:	180mm Post Mount, Max Rotor Size 203mm

REAR AXLE:	Carbon: Syntace X12 148, 1.0mm Thread Pitch Alloy: 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: Small 220mm \| Medium 250mm \| Large 290mm \| XL 320mm \| XXL 350mm Alloy: Small 240mm \| Medium 270mm \| Large 310mm \| XL 335mm \| XXL 360mm

MAX CHAINRING SIZE:	32T Standard Single Ring

MAX TIRE SIZE:	29 x 2.6

REAR SHOCK SAG:	150mm/62.5mm: 16-20mm (26-32%) 140mm/57.5mm: 15-19mm (26-33%)

WARRANTY AND RIDER SUPPORT

At Transition Bikes, we take pride in building products designed to handle the ever-increasing demands of modern mountain biking. From the world-renowned terrain right in our PNW backyard, to the sport's biggest stages across the globe, our bikes are meant to be ridden hard by riders pushing the limits of what a mountain bike can do. The mission of our Rider Support Team is simple: Keep our riders riding when things go sideways. Transition Bikes offers real, human support via phone, live chats, and email between the hours of 9am and 5pm PST, Monday through Friday. Whether you're the original owner, purchased your Transition secondhand, or picked one up from your local dealer's demo fleet, we are committed to finding you a fair and timely solution.

UNLIMITED RIDER SUPPORT

ALL Transition frames are covered by our Unlimited Rider Support program. This program keeps you riding by providing discounted replacement frame parts or repair assistance in the event of damage - regardless of how it happened, or whether you're the original or a secondhand owner. If we are unable to replace or repair your frame part, we will work with you to find a suitable solution.

LIFETIME WARRANTY

The SENTINEL, released in 2021, is covered for life against manufacturing defects. This policy applies to original owners only. Lifetime Warranty covers defects in materials and workmanship for the useful life of the product. Riders must register their product on our site by providing the serial number and proof of purchase. Our lifetime warranty does not cover normal wear-and-tear, failures caused by lack of maintenance, cosmetic damage including paint aging or fading, paint damage caused by the installation or removal of frame protection or adhesives, modifications from the original configuration, or labor costs associated with warranty repairs or replacements.

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 ‘Unlimited Rider Support’ (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.

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. 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 rider support 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.

*We strive for consistency, and our aim is to provide identical, color-matching replacement parts wherever possible. Depending on availability, variations in paint batches, and paint fading slightly with age, a replacement part may come in a slightly different shade, or in some cases, a different color altogether. These differences are cosmetic only, and do not affect the performance of your bike.

WARRANTY/RIDER SUPPORT CLAIM FORM

To submit a Warranty/Rider Support 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 rider support policies, please email us at warranty@transitionbikes.com or call us by phone, at (360) 230-8596.

Can I pre-order a bike?

We do not accept pre-orders for direct purchase, but you can sign up to be notified when an item comes back in stock. If you are a customer who is looking to order a bike through your local Transition dealer or through the Transition Factory Outpost Store you will want to reach out to them directly.

Can I run a fork with more offset?

Yes, but this bike is built with SBG technology, which utilizes an offset in the range of 42-44mm. Running a fork with more or less offset would be taking away from the SBG technology package.

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 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

I want to replace all of my pivot bearings, is there a bearing kit?

This bike uses the Enduro MAX Bearing Kit For Trunnion Mount Frames (2018-2023) - Part Number 01.18.91.6840

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.

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.