From Unofficial Zero Manual
Revision as of 21:39, 31 March 2020 by BrianTRice (extract from manual)
Rear Shock Mounting
|2013-2014||FastAce||BDA58RC||Piggy-back reservoir shock with adjustable spring preload, compression and rebound damping||
||S/SR||6.35 in (161 mm)||10.25-10.5 in (260mm)|
|DS||7.03 in (179 mm)|
|2015-2020||Showa||40 mm piston, piggy-back reservoir shock with adjustable spring preload, compression and rebound damping||S/SR||6.35 in (161 mm)|
|DS/DSR||7.03 in (179 mm)|
|2013-2014||S/SR||Yes||JRI Double-Adjustable Shocks per 2014 SR shock absorber replacement by Doug S with Harlan's help.|
|Yes (with machining)||Wotefusi  260mm Central Air Shock Absorber Universal Fit - fits when mounted upside down. Need to cut/grind down the bushing.|
|Yes (with machining)||TDPRO 260mm 10.2  Almost fits; the area on top of the spring is just slightly too large. You can take a grinder and shave away some of the top to make it fit. |
|NO||The Yamaha R3 has the same length rear shock, but the spring is too wide.|
|NO||Fastace Rear Shock BDA-51AR/58-AR has a weaker spring, and is rotated 90 degrees. |
|Mixed results - new orders may have all the kinks worked out.||IKON 3610-ZERO-S Shock Absorber  - The spring is too wide at the top, and to be installed, the sping must be compressed. When Installation is complete, the spring is always compressed by at least a couple centimeters.|
|Mixed results - Get dimensions from Wilber's dealer before ordering - theirs is ~279mm||Wilbers Shock absorber Type 640 Road Part. No.: 640-1143-00  Wilbers claims the shock fits "2011-2013 S M5" (which does not exist). The M5 designation is buried in the VIN of the 2014 S; and may or may not be relevant. This shock could be mislabeled for the DS. Make sure to get full dimensions before ordering.|
|Yes - DO NOT BUY||ZXTDR Rear Shock Absorber Suspension Sensa-Trac Load Adjusting for Dirt Pit Bike Motorcycle 1200LBS.  This shock phyisically fits, but underperforms. It feels like you're riding on a trampoline. You get what you pay for.|
- The Official Manual section on Rear Shock Adjustment illustrates how to measure preload and check sag.
- The official manual's description here is adequate and this can be done readily by hand on the right side of the bike at the top of the shock.
- The adjustment knob is at the bottom of the shock facing rear, as described in the manual, and can be worked by hand or with a wrench with a careful reach into that area.
- Spring Preload
- The official manual illustrates the collar and procedure for spring preload adjustment, but does not recommend a specific tool, and there are clearance issues in that area for tools.
- The adjuster sleeve diameter is 58mm (2.3").
- A Stockton spanner wrench was found to be suitable for the job if modified as follows (per 2017 DSR Showa rear shock spanner wrench):
- Grind the nose of the wrench to fit the notches.
- Bend the wrench a couple of degrees to clear the Sevcon motor controller fins.
- Obviously, a better solution is still worth seeking.
- A small suspension wrench / ER collet spanner size 30/32 can be use even with the lack of clearance