Transition Bikes Sentinel

The Hard Charging
All-Rounder
The Sentinel inspires confidence like you're wearing full body armor.

It's forgiving do-it-all attitude truly blurs the lines between planted bottomless sender and playful poppy trail pony. Whether you're chasing EWS dreams or just a weekend afternoon escape, it will bring out the best in you. So easy to get 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 you rolled, now you boost.

AVAILABLE COLORS:

MISTY GREEN		BLACK POWDER

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$4,099 $3,099 USD

$5,299 $3,699 USD

$6,499 $4,999 USD

$7,999 $5,799 USD

$2,199 $1,399 USD

$3,699 $2,999 USD

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$4,099 $3,099 USD

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View Closeout Sentinel Models Here!

PRICE

$4,099 $3,099 USD

$5,299 $3,699 USD

$6,499 $4,999 USD

$7,999 $5,799 USD

$2,199 $1,399 USD

$3,699 $2,999 USD

COLOR OPTIONS

	Misty Green
	Black Powder

	Misty Green
	Black Powder

	Misty Green
	Black Powder

	Misty Green
	Black Powder

	Misty Green
	Black Powder

	Misty Green
	Black Powder

FRAME

Sentinel Alloy 150mm

Sentinel Carbon 150mm

Sentinel Alloy 150mm

Sentinel Carbon 150mm

WHEEL SIZE

29"

REAR SHOCK

Fox Float X Performance
(205x62.5mm)

Fox Float X Performance Elite
(205x62.5mm)

Fox Float X2 Factory
(205x62.5mm)

Fox Float X Performance Elite
(205x62.5mm)

Fox Float X2 Factory
(205x62.5mm)

FORK

Fox Float 36 Rhythm
(160mm)

Fox Float 36 Grip 2 Performance Elite
(160mm)

Fox Float 36 Grip 2 Factory
(160mm)

HEADSET

FSA No.57E

STEM

RaceFace Aeffect R (40mm)

ANVL Swage (40mm)

HANDLEBAR

RaceFace Chester 35
SM/MD(780x20) LG/XL/XXL(780x35)

ANVL Mandrel Alloy 35
SM/MD(800x20) LG/XL(800x30) XXL(800x40)

OneUp Carbon Bar
SM/MD(800x20) LG/XL/XXL(800x35)

GRIPS

ODI Elite Flow

SADDLE

ANVL Forge Cromo
or
SDG Bel Air 3

SEATPOST

OneUp Dropper Post
SM(150mm) MD(180mm) LG/XL/XXL(210mm)

BRAKES

SRAM Guide RE 4-Piston

TRP DH-R-Evo

ROTORS

SRAM Centerline (200mm)

TRP R1 2.3 (203mm)

SHIFTER

SRAM NX Eagle MMX

SRAM GX Eagle

SRAM GX AXS (Rocker Paddle)

DERAILLEUR

SRAM NX Eagle

SRAM GX Eagle

SRAM GX AXS

CASSETTE

SRAM PG 1230 (11-50t)

SRAM XG 1275 (10-52t)

SRAM XG 1295 (10-52t)

CHAIN

SRAM NX Eagle

SRAM GX Eagle

SRAM XO1 Eagle

CRANK

SRAM Descendent 6k DUB
(30t/170mm)

SRAM GX Eagle DUB
(30t/170mm)

SRAM X1 Carbon DUB
(30t/170mm)

RIMS

Stans Flow D
or
WTB ST i30

DT Swiss M 1900 Spline 30
or
RaceFace Aeffect R

RaceFace Aeffect R

SPOKES

Pillar Double Butted

DT Swiss Champion
or
RaceFace 2.0/1.7/2.0

RaceFace 2.0/1.7/2.0

HUBS

Novatech D791SB/D902SB

DT Swiss 370 Ratchet LN
or
RaceFace Trace 28H

RaceFace Trace 28H

TIRE/FRONT

Maxxis Assegai 3C EXO+ (2.5)

TIRE/REAR

Maxxis Minion DHRII 3C EXO+ (2.4)

INCLUDED

Tubeless Valves & Sealant

SRAM AXS Battery Charger Tubeless Valves & Sealant

WEIGHT

35.8 lbs/16.24 kg (Size MD)

33.9 lbs/15.38 kg (Size MD)

31.7 lbs/14.38 kg (Size MD)

31.6 lbs/14.33 kg (Size MD)

9.7 lbs/4.4 kg (Size MD w/ Shock)

7.0 lbs/3.20kg (Size MD w/ Shock)

Specs are subject to change at any time. All complete bikes are 95% assembled and packaged for quick and easy final assembly, and as such, Transition Bikes is not able to make special request build spec changes or modifications to packaging.

FRAME FEATURES

1. Lifetime Warranty
At Transition Bikes we take pride in the quality of our products and are stoked to offer a lifetime warranty for the original owner and our stellar crash replacement program. We got your back so you don't have to worry about your bike.

2. Frame Material
The Sentinel carbon uses premium Japanese Toray fiber using a unique latex coated EPS molding process to create tighter edge radius control using less material. The Sentinel alloy features a frame made from tough and dependable heat treated 6061 aluminum to strike the right balance of strength, durability and ride quality.

3. Pivot Technology
Collet main pivot technology improves rear end stiffness and keeps your pivot hardware tight. Additional bearing shields prevent main pivot bearing contamination when washing your bike or riding in wet conditions.

4. Frame Protection
We keep your bike rides quiet and your frame safe from damage with fully integrated, flush-mounted rubber frame protection at all critical areas. In addition to downtube and seatstay protection, the ribbed chainstay protector features expanded coverage of the rear dropout pivot area.

5. Enduro Max Bearings
We exclusively use Enduro Max suspension pivot specific bearings in standard sizes that are readily available worldwide. Dual bearings are used at the dropout pivots for frame stiffness and additional c-clips lock the rocker bearings in place under torsional loads.

6. Gear Accessory Mount
Our underside top-tube accessory mount allows you to carry a spare tube or other goodies safely on your frame in case you are looking to ditch the backpack.

7. Mega Seatpost Insertion
Dropper posts keep getting longer so we combine short seat tube lengths with mega seatpost insertion to help get your saddle completely out of the way.

8. Tire Clearance
Ample clearance for mud and tires up to 2.6" width.

9. User Friendly Cable Routing
To simplify maintenance and keep your bike noise free, the rear derailleur cable is routed through guide tubes in the front triangle and chainstay.

Feature available on carbon framesets only.

10. Threaded BB
A standard 73mm threaded bottom bracket shell makes crankset maintenance hassle-free and prevents unwanted press-fit BB related noises.

11. Press In Headset
Our ZS44/ZS56 press in headset gives you the freedom to use angle adjust headsets if you feel the need to make your bike a touch slacker or a touch steeper.

Angleset headset does not come with framesets or complete bikes.

12. Water Bottle Compatibility
We keep your water bottle clean inside the front triangle so you can keep hydrated without worrying about mud making it to your mouth.

1. Lifetime Warranty

At Transition Bikes we take pride in the quality of our products and are stoked to offer a lifetime warranty for the original owner and our stellar crash replacement program. We got your back so you don't have to worry about your bike.

2. Frame Material

The Sentinel carbon uses premium Japanese Toray fiber using a unique latex coated EPS molding process to create tighter edge radius control using less material. The Sentinel alloy features a frame made from tough and dependable heat treated 6061 aluminum to strike the right balance of strength, durability and ride quality.

3. Pivot Technology

Collet main pivot technology improves rear end stiffness and keeps your pivot hardware tight. Additional bearing shields prevent main pivot bearing contamination when washing your bike or riding in wet conditions.

4. Frame Protection

We keep your bike rides quiet and your frame safe from damage with fully integrated, flush-mounted rubber frame protection at all critical areas. In addition to downtube and seatstay protection, the ribbed chainstay protector features expanded coverage of the rear dropout pivot area.

5. Enduro Max Bearings

We exclusively use Enduro Max suspension pivot specific bearings in standard sizes that are readily available worldwide. Dual bearings are used at the dropout pivots for frame stiffness and additional c-clips lock the rocker bearings in place under torsional loads.

6. Gear Accessory Mount

Our underside top-tube accessory mount allows you to carry a spare tube or other goodies safely on your frame in case you are looking to ditch the backpack.

7. Mega Seatpost Insertion

Dropper posts keep getting longer so we combine short seat tube lengths with mega seatpost insertion to help get your saddle completely out of the way.

8. Tire Clearance

Ample clearance for mud and tires up to 2.6" width.

9. User Friendly Cable Routing

To simplify maintenance and keep your bike noise free, the rear derailleur cable is routed through guide tubes in the front triangle and chainstay.

Feature available on carbon framesets only.

10. Threaded BB

A standard 73mm threaded bottom bracket shell makes crankset maintenance hassle-free and prevents unwanted press-fit BB related noises.

11. Press In Headset

Our ZS44/ZS56 press in headset gives you the freedom to use angle adjust headsets if you feel the need to make your bike a touch slacker or a touch steeper.

Angleset headset does not come with framesets or complete bikes.

12. Water Bottle Compatibility

We keep your water bottle clean inside the front triangle so you can keep hydrated without worrying about mud making it to your mouth.

Speed Balanced Geometry SBG ensures the bike maintains low speed agility, front wheel traction, and proper rider weight balance while actually increasing confidence in steep terrain and at high speeds. With SBG, a slacker head tube angle is combined with a reduced offset fork standard, preventing the front wheel from being too far in front of the rider. This improves front to rear weight distribution on the bike, which is often out of balance on long and slack bikes. One of SBG's greatest benefits is that it creates a confident steering feel that adapts to wheel speed. More stability when going fast, more agility on technical slow speed maneuvering as well as improved traction, control and confidence for any skill level of rider.
	SM	MD	LG	XL	XXL

A. REACH	420	450	476	501	521

B. STACK	613	622	631	640	649

C. EFFECTIVE TT LENGTH	552	585	613	641	665

D. SEAT TUBE LENGTH	350	390	430	460	490

E. EFFECTIVE ST ANGLE	78.2°	77.5°	76.9°	76.4°	76.0°

SADDLE HEIGHT FOR EFFECTIVE ST ANGLE	600	660	720	780	820

ACTUAL ST ANGLE	70.8°	70.8°	70.8°	70.8°	70.8°

SEAT TUBE OFFSET AT BB	87	87	87	87	87

F. HEAD TUBE LENGTH	100	110	120	130	140

G. HEAD TUBE ANGLE	63.6°	63.6°	63.6°	63.6°	63.6°

H. CHAINSTAY LENGTH	440	440	440	440	440

I. WHEELBASE	1199	1233	1263	1292	1316

J. BOTTOM BRACKET DROP	29	29	29	29	29

K. ESTIMATED BB HEIGHT	346	346	346	347	347

L. STAND OVER HEIGHT	671	688	700	712	722

M. FORK OFFSET	43	43	43	43	43

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.

"Personally, I've always been a bit averse to longer travel, 29" wheeled bikes with much more than 130mm to 140mm of travel as they've always just felt like "a lot of bike" to me, at least for the riding at home in Santa Cruz, but the Transition Sentinel has me rethinking that. I've never ridden a Horst link bike that climbs so efficiently, never been able to manual a bike with 440mm chainstays so easily, and I've never felt so centered and "in it" on a bike

On my first romp aboard the Sentinel, I was overshooting jumps and drops by bike a bike length or two where I used to kiss the knuckle on my other bikes. It has so much pop and perfectly walks that fine line of freakishly nimble in the tame, yet sure footed in the gnar. The frame is substantially lighter in weight than I had expect from Transition, and the new industrial design is easy on the eyes while still nodding to functionality and smart features. As far as versatility is concerned, it's a nice option to be able to run a shorter 57.5mm stroke shock and 150mm fork if you wanted to err toward more of an all day ride - you could also go the other way and put a coil shock and a 170mm fork on if you really wanted to get gnarly. The increased rate of progression is absolutely dead on and they nailed the kinematics and tune." - MTB-MAG.com - FULL REVIEW HERE

"I kept going back to this feeling that it just excelled everywhere. I really liked pedaling on this bike. Like, a lot. Whether it be technical single-track or endlessly winding fire road"

"The more progressive leverage curve gives the back end a responsive lively personality under foot with a magical bottomless feel towards the end of its travel." - Bike Magazine - FULL REVIEW HERE

"Wow, the Sentinel packs it all into one rig. I've cleaned more techy climbing sections, felt more confident on blind trails, and overall had more fun riding the Sentinel than many previous bikes. If you're looking for a beast of a bike for a mix of trails and terrain that can still hold it's own when it's time to pedal bike to the top, the Sentinel is for sure the bike for you." - MTBR.com - FULL REVIEW HERE

"The new version is no slouch when it comes to straight-line plowing, but now I'd categorize it as more of an aggressive all-rounder rather than a downhill specialist. It's well-suited to my favorite types of rides - big, long adventures with a focus on steep and rough trails that can only be accessed after a sustained uphill grind" - Pinkbike.com - FULL REVIEW HERE

"After a few weeks worth of rides, the new Sentinel is a honkin' beast of a trail bike. Yes, it still feels like a trail bike. Despite the numbers, it doesn't suffer from feeling like too much of a plow - it pops when you want to pop, switches from one side of an s-turn to the other, and provides enough length to move about forward and aft to distribute traction as I need it. Like its predecessor, it falls somewhere between trail bike and all-mountain bike." - NSMB.com - FULL REVIEW HERE

"As for the new Sentinel, the biggest update is an extra 10mm of travel. While this might not seem like much, it brings the bike into a new category of sendability. The steadfast feeling that the company’s bikes are so well known for, simply because it’s perfectly suited to the Northwest, hasn’t wavered, yet they’ve also managed to ramp up the responsiveness and playfulness." - Freehub Magazine - FULL REVIEW HERE

Frame Specifications

REAR TRAVEL:	150mm (Compatible with 140mm)

FRONT TRAVEL:	160mm

WHEEL SIZE:	29"

SIZES:	SM, MD, LG, XL, XXL

COLORS:	Carbon: Loam Gold, Ti Grey Alloy: Cascade Blue, Platinum Silver

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%)

FAQ'S