The Yeti SB5c is a popular 5-inch travel trail bike known for its Switch Infinity suspension platform. Keeping that suspension in top shape requires knowing the right parts and understanding compatibility. Whether you're replacing worn components or looking to upgrade, this guide covers everything you need to know about Yeti SB5c suspension parts.
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Understanding the Yeti SB5c Suspension System
The SB5c uses a unique linkage design that pivots around the Switch Infinity cartridge. The system demands precise parts alignment to maintain its supple feel and climbing traction. The main suspension components are the rear shock, front fork, and all the hardware that connects them.
Rear Shock Specifications
Most Yeti SB5c frames are designed for a 7.5 x 2.0 inch (eye-to-eye x stroke) rear shock. Popular original equipment (OE) options include Fox Float DPX2, Fox Float DPS, or RockShox Monarch. Aftermarket shocks from Fox, RockShox, and DVO can be fitted, but you must match the eyelet width (standard 8mm or 5/16-inch) and ensure the piggyback reservoir clears the frame. Some SB5c frames have clearance issues with large canisters, so always check your specific frame year.
Fork Travel and Axle Compatibility
The SB5c is designed for a 130mm to 140mm travel fork (depending on frame size and build). It uses a tapered steerer and 110x15mm Boost axle. Common factory forks include Fox 34 or 36 and RockShox Pike. When replacing the fork, confirm the offset (usually 44mm or 51mm) and disc brake mount type (post mount, typically 160mm or 180mm rotor). A fork with too much travel will slacken the head angle and void warranty.
Key Suspension Wear Items
Over time, certain suspension parts require replacement due to wear. Ignoring these can lead to poor performance and even damage to the frame.
Rear Shock Bushings and Hardware
The shock bushings take a beating from alignment and pivoting. On the SB5c, the lower shock mount uses a 12.7mm (0.5 inch) inner diameter bushing, while the upper mount is often 8mm. Yeti uses DU (delrin) bushings that can wear and develop play. Replace them every 100-200 hours of riding. Aftermarket aluminum bushings from companies like Enduro Bearings offer longer life but can transmit more vibration.
Pivot and Linkage Bearings
The SB5c has multiple pivot points, each using sealed cartridge bearings. The most critical are the main pivot and the Switch Infinity cartridge pivots. Use only high-quality bearings with proper seals (e.g., Enduro branded). When replacing, note that the SB5c uses both 6802 and 6902 series bearings depending on the link. A full bearing kit includes all bearings and dust seals. Replacing them annually or every 200 hours keeps the suspension smooth.
Switch Infinity Cartridge Service
The Switch Infinity system uses a sliding cartridge with a bushing and seals. Over time, the cartridge can develop stiction or leaks. Replacement cartridge kits are available from Yeti and aftermarket sources. If you notice a loss of sensitivity or creaking, service the cartridge promptly. The cartridge does not require special tools but does involve removing the main pivot.
Upgrading Suspension Parts on the Yeti SB5c
Upgrading can improve performance, but compatibility is paramount.
Coil vs. Air Shock Considerations
Many SB5c owners consider a coil shock for more consistent traction. However, the SB5c frame geometry is relatively progressive, which can make a linear coil shock feel harsh without a progressive spring. If you go coil, choose a shock with adjustable progression (e.g., Fox DHX2 with a tuneable compression circuit) and a spring rate that matches your weight plus gear. Avoid randomly swapping to a coil shock without checking frame clearance for the spring.
Fork Upgrades
Common upgrades include a Fox 36 (for a stouter front end) or a RockShox Pike Ultimate. Ensure the fork travel stays within 140mm and crown clearance is adequate. A longer fork also raises the bottom bracket height, affecting handling. If you switch to a 140mm fork, consider a slight offset increase to maintain steering feel.
Upgrading to Aftermarket Bushings and Bearings
High-end straight roller bearings or bushings can reduce friction. However, the SB5c suspension is already low-friction by design. Many riders find that simply replacing worn OEM bearings with quality sealed units (like Enduro Max) is sufficient. Avoid chasing marginal gains with exotic materials unless you are a pro racer.
Sourcing Compatible Parts
Genuine Yeti parts are available through authorized dealers. For bearings, kits from Enduro Bearings or Kogel Bearings are direct fit. For shock hardware, check with shock manufacturers directly. When buying aftermarket, always reference your frame's manufacturing year and serial number. Yeti changed linkage designs slightly over the SB5c's production run (2015-2018). Using a part meant for a different year can cause fitment issues.
Maintenance Tips for Yeti SB5c Suspension
Regular maintenance extends the life of your suspension. Clean the stanchions after each ride. Service the fork and shock every 50 hours (air can and seal replacements). Replace bearings annually or when play develops. Lubricate pivot points with a silicone-based grease to prevent corrosion. Check torque on all suspension bolts (especially the Switch Infinity mounting bolts) before every ride.
Final Recommendation
Stick with OEM or high-quality aftermarket parts that match the exact specifications for your SB5c. The most impactful upgrade is keeping the suspension well-maintained: clean, properly torqued, and with fresh lubricant. If you want to upgrade, consider a newer damper (like Fox GRIP2 for the fork) or a shock with a piggyback reservoir for better thermal management. Avoid mix-and-match parts that stray from factory specs, as the SB5c's suspension is tuned to work as a system. When in doubt, consult your local Yeti dealer for part numbers and installation guidance.