YETI SB4.5 - Mountain Bicycle Manual

THE LOWDOWN ON THE SB4.5 AND ITS FEATURES

1. SWITCH INFINITY TECHNOLOGY PATENTED SUSPENSION SYSTEM
2. HIGH MODULUS CARBON FIBER MAIN FRAME AND SWING ARM
3. COLLET AXLE SYSTEM ON PIVOTS REDUCES BEARING WEAR
4. OPTIMIZED FOR 1X DRIVETRAINS ONLY
5. TAPERED INSET HEAD TUBE (44MM/56MM)
6. SUSPENSION BY FOX (7.5 X 2.0)
7. CUSTOM DEBRIS AND CHAIN SLAP GUARDS
8. INTERNAL CABLE ROUTING
9. INTEGRATED AXLE AND DERAILLEUR HANGER SYSTEM

1. The SB4.5 delivers 4.5 inches (114mm) of travel with our patented Switch Infinity Technology. Efficient pedaling performance while still smooth and continuous when the going gets rough.
2. High modulus carbon provides a stiff, strong and light weight chassis. (5.4 lbs)
3. Colleted pivot axles help create a stiff interface between the front and rear triangles of the frame. Custom Enduro Max sealed bearings keep things moving freely at the pivots.
4. The SB4.5 does away with the front derailleur mount, making it a 1x drive specific frame. This increases stiffness in the frame, making the SB4.5 one of the stiffest bikes in our lineup.
5. Using our inset head tube on the SB4.5 allows for a larger head tube with more area, increased stiffness, and lower overall ride height without compromising any performance.
6. The SB4.5 uses a 2 inch stroke, 7.5 inch eye to eye Float EVOL shock, by Fox Racing Shox.
7. Custom guards on the seat stay, chain stay and down tube keep things quiet while riding and protect the frame.
8. The SB4.5 features internal routing for all cables, making the bike quiet and clean looking as well as reducing cable rub on the paint.
9. Dedicated 12 x 148 Boost dropouts and integrated hanger with axle threads for strength, stiffness, ease of hanger and wheel installation.

GEOMETRY

FOX 34 / 140MM FORK

*All measurements are in millimeters

FIT

KEEP YOUR YETI FRESH AND CLEAN

OVERVIEW

Following these guidelines will help maintain the performance of your bicycle and prevent more serious problems from arising. It is important to remember that service intervals can vary depending on climate, trail conditions and riding frequency. If you are unsure about working on your own bicycle, contact your authorized Yeti Dealer or visit the repair help section at www.parktool.com for more information on general bicycle maintenance.

SCHEDULE

TORQUE

Yeti strongly recommends using a torque wrench when assembling your frame. Torque specifications for individual parts on the SB4.5 are listed below, as well as in the step by step assembly instructions later in the manual. For general bicycle maintenance please consult the torque specifications of the component you are adjusting.

KEY TORQUE SPECS

SHOCK SETUP

YETI TIPS
Inspect your shock for any visible damage. If oil is leaking or you notice any damage to the surfaces or seals, please contact the Fox Racing Shox service center for repair at 800. FOX.SHOX or your local bike shop.
Shock set-up can fluctuate greatly based on the rider. The set-up guide is intended as a base line to get the rider started. Experiment with your settings to find the set-up that works best for you.
We recommend starting out with 30% sag, which is 15.25mm of shock stroke.

TOOLS NEEDED

• Shock Pump
• Metric Tape Measure

QUICK START GUIDE

*All clicks are counted clockwise, rotating from the all the way out or counter - clockwise dial position.

1. AIR PRESSURE
   The main air spring controls sag. For the SB4.5 to ride properly it is important to setup the shock with the correct amount of sag. The SB4.5 works best with 15.25MM of measured sag. To increase sag, reduce the main spring air pressure. To reduce sag, increase the main spring air pressure. Cycle the shock at least 10 times to equalize the EVOL chamber before measuring sag.
   
2. SAG
   Once you have set your baseline air pressure and cycled the shock you are ready to measure the sag. To measure the sag slide the travel indicator (O-Ring) up against the shock body. With a friend supporting the bike and with the shock in "open," sit on the saddle (do not bounce) and allow your body weight to compress the shock. Once you have compressed the shock, get off the bike and measure the distance between the shock body and the new position of the travel indicator (O-Ring). This is your sag.
   
3. REBOUND
   Rebound is adjusted using the red knob on top of the shock. Clockwise will slow the rebound, counter clockwise will speed it up. Rebound needs to be tuned to rider preference and air spring pressure. Too slow and the bike will feel like it is not ready for the next bump. Too fast and it will feel like the bike is bucking you off after an impact.
   
4. COMPRESSION
   Low-speed compression is adjusted in the "open" position, using the black tabs and has 3 positions. 1 is wide open, 3 is more firm. This adjustment is subtle. The blue lever has 3 positions: Open, Medium and Firm. For our bikes, unless you are on pavement on the way to the trail, we recommend using the "open" setting. The Switch Infinity design will do the rest.
   

DERAILLEUR HANGER INSTALL

YETI TIPS
NOTE: The hanger cap is REVERSE THREADED. Be careful not to strip out the Hanger tool faces. The cap is marked with a tighten direction arrow.
Inspect the frame around the hanger seat for any suspicious damage any time you replace a hanger, especially if you are replacing it due to damage.

TOOLS NEEDED

• 6mm Allen key
• Grease

1. HANGER SEAT
   Lightly grease the outside surface of the hanger where it interfaces with the frame. The hanger will fit into its space on the inside of the swing arm and should press easily into the frame.
   
2. HANGER CAP SEAT
   Lightly grease the threads on the hanger cap. The hanger cap REVERSE threads into the hanger from the outside of the swing arm. Hand thread the cap into the hanger.
   
3. TIGHTENING
   Using a 6mm allen key, tighten the hanger cap into the hanger. REMEMBER, it is REVERSE THREADED. Follow the "Tighten" arrow on the cap. Finigh tightening with a torque wrench if available.
   *Torque to 80 in/lbs (9Nm)
   
4. COMPLETED
   The installed hanger and cap should look like this, sitting flush against the frame on both the inside and outside of the swing arm. If the hanger or cap are not sitting flush against the frame, remove them and inspect the frame surfaces for debris as well as the threads for damage.
   

CABLE SETUP

The SB4.5 uses internally routed full length cable housing. By using full cable housing, we have eliminated break points in the line of your shifter housing. This allows for better overall shifting performance by reducing the entrance of unwanted elements such as sweat and sediment. By routing that housing internally we add to the protection from the elements and clean up the lines of the bike. No more zip ties to snag your shorts on and no more loose housing rattling around on your paint.
Do not remove any of the housing guide tubes that are installed in your new frame and swing arm. They will be used to pull your housing through the frame. If you are replacing used housing, use the old housing to pull your new housing through the frame.
If you don't have the guide tubes or old housing you can fish the housings through the frame, but it will be easier to use an internal cable routing tool.

The failure to properly route shifter housing can cause malfunction of the shift mechanism and unexpected shifting of gears.

REAR BRAKE AND DERAILLEUR
Your rear brake and shifter housing should run parallel around the left side of the head tube. Run the shifter housing and the brake housing into the individual ports at the head tube and thread them down into the down tube toward the exit ports above the Infinity Link. The shift housing comes out of the port on the drive side and goes immediately into the corresponding port on the swing arm. The brake housing does the same on the non-drive side.

NOTE: Using rubbing alcohol to help the housing pass through the grommets in the frame as you thread them.
Also, starting at the back of the bike and working forward will be necessary for some brake systems.

REAR DERAILLEUR CONTINUED
The rear derailleur housing will exit the swing arm via the port on the top of the seat stay, right above the rear derailleur. Create a gentile curve to the derailleur and adjust to the manufacturers specifications.

REAR BRAKE CONTINUED
The rear brake housing exits the swing arm on the inside of the chain stay and goes directly up to the caliper. If your caliper allows, adjust the housing attachment angle to reduce the bend in the cable as much as possible.

INTERNALLY ROUTED SEAT POST
The SB4.5 is designed to use an internally routed dropper post. The housing should be routed form the post forward. Guide your housing through the seat tube and into the down tube use the guide tube installed in our new frames, or use the old housing if you are replacing the line on a used bike. The line should exit the down tube at the head tube on the drive side and curve around the head tube to the lever on the left side of the bar. If you are mounting your lever on the right side, you would simply route that housing over to the right. If you do route to the right we recommend placing some clear vinyl in from of the port to prevent cable rub.

FRAME ASSEMBLY

YETI TIPS
Make sure your tools are in good condition. A worn allen key can round the hex on a bolt not allowing for proper torque.
Torque settings are listed throughout the instructions. It is important to prep all bolt threads. The instructions denote whether to use a Loctite compound or grease.

Service on Yeti bicycles requires special knowledge and tools. Yeti Cycles recommends that all service and repairs be performed by an authorized Yeti Dealer

TOOLS NEEDED

• 2.5mm allen key
• Two - 5mm allen keys
• Two - 6mm allen keys
• 10mm allen key
• Guide pin tool
• Grease
• Blue (242) Loctite
• Pink (222) Loctite
• Torque wrench

1. All the parts you'll need to get your SB4.5 frame assembled. Please refer to to the exploded view later in this manual for more information.
   
2. Slip washers onto and apply blue (242) Loctite to the 4 bolts that secure the Switch Infinity Link to the frame. Insert them into their place and hang the black fitting washers from them. Place washers with the flat side flush to the frame and opening.
   
3. Insert the Infinity Link from the non-drive side. The Infinity logo should be up and the Fox logos facing the non-drive side. Rock the link into place capturing the black fitting washers. Make sure that they have not slipped or rotated. The flat end of the fitting washers must be facing the opening in the frame and they must nestle into the Infinity Link stanchions.
   
4. While holding the link in place lightly tighten the bolts. You want them to snug so that the link does not move and so that the fitting washers are fully captured, but don't try to torque them by hand! Finish the job with a torque wrench.
   *Torque to 12 Nm
   
5. Place the keyed alloy collet axle nut into its corresponding inset in the frame.
   
6. Apply a small amount of grease to the bearings on the smaller end of the link to help hold the link spacers in place while you install it.
   
7. Apply blue Loctite (242) to the threads of the collet axle and a light amount of grease on the shaft. Slip the link into place in the front triangle and slide the collet axle through it to hold it in place. Thread the axle into the keyed nut using a 5mm allen, but do not over tighten.
   *Torque: 3Nm
   
8. Using a torque wrench with a 5mm allen, finish tightening the lower link collet axle.
   *Torque: 8Nm
   
9. Prep the inside of the collet axle and the threads of the collet wedge bolt with grease. Using a 4mm allen, thread the collet wedge into the collet axle. Finish with a torque wrench. Wipe up any excess grease around the collet axle when done.
   *Torque: 8Nm
   
10. Prepare the swing arm by inserting the alloy collet axle nuts in their corresponding insets and peeling the blue protective film off of your chainsuck protector.
    
11. Grease the main pivot collet axle shaft and threads. Then, slide the main pivot into place. Insert the main pivot collet axle. Use your guide pin to help guide the axle through the bearing spacer and bearings.
    
12. Using a 10mm allen, thread the collet axle into the nut on the far side and hand tighten. Use a torque wrench to finish tightening the collet axle.
    *Torque: 3.5Nm
    
13. Lightly grease the upper link bearings to stick the upper link pivot spacers in place while you slide the link into the swing arm.
    
14. Apply blue Loctite (242) to the threads and grease on the shaft of the upper link collet axle. Guide the collet axle through the swing arm and link using a guide pin. Hand thread the collet axle into the nut using a 5mm allen. **Do not torque at this time! You need to leave the upper link pivot a little loose to assist in installing the shock.
    
15. Install the rear shock using guide pins to hold it in place.
    
16. Apply Blue Loctite (242) to a Ti male bolt and thread into one end of the pivot axle and tighten until flush. Place the 8.5mm washer over the rear shock pin. Using the shock pivot axle, slide the guide pin out the far side of the swing arm. Repeat up front using the front (shorter) shock pivot axle.
    
17. Finish the rear shock install by threading the Ti male bolt with a 6.5mm washer on it into the shock pin. Using a 5mm allen and a torque wrench finish tightening.
    *Torque to 7Nm
    
18. Torque the upper link collet axle to 8Nm. Grease the inside of the collet axle and the threads of the collet wedge bolt and install using a 4mm allen. Finish with a torque wrench.
    *Torque:
    Upper link collet axle - 3Nm
    Upper link collet wedge - 8Nm
    
19. Grease the inside of the main pivot collet axle and the threads on the collet wedge. Using a 5mm allen, thread the collet wedge into the collet axle. Finish with a torque wrench.
    *Torque: 14Nm
    
20. Finish by wiping up any excess grease from the assembly process. Double check your torque on accessible bolts and get ready to install your parts!
    

EXPLODED VIEW

EXPLODED VIEW PARTS LIST

REBUILD KITS

YETI CYCLES621 Corporate Circle, Unit B
Golden, CO 80401
(p) 303-278-6909
(f) 303-278-6906
www.yeticycles.com

BUSINESS HOURS
Monday-Friday
8AM-11:30AM, 1:00PM-5:30PM
(Mountain Time)