ROCKERBONE ROCKER DROPOUT TENSIONER
Precision cast, finish machined, and hard anodized for durability, the ROCKERBONE is a lightweight, convenient, effective, and affordable dropout tension tool that installs on Rocker style dropouts.
The ROCKERBONE provides more surface contact with the dropout face over stock bolts and washers alone, increasing rigidity and power transfer. Ideal for Gates Carbon Drive and other belt systems, and works great with chains, too!
TWO TOOL OPTIONS
8mm Hex fitting works with multi-tools out in the field and is slightly oversize to provide for the presence of dirt or debris in real-world conditions.
19mm Wrench fitting works with basic shop tools and makes for a convenient point of leverage for quick and accurate belt drive train set ups.
To work properly, the ROCKERBONE must be used with the included pairs of bolts and washers, which are custom machined for full thread engagement and plated for extreme durability.
(Using a longer bolt may result in interference with cassette lockrings.)
DIRECTIONS
1) Ensure that all dropout surfaces -- frame, insert, ROCKERBONE -- are clean, dry, and free of any grease or lubricants.
2) Using the supplied hardware, assemble each Rocker unit as normal, with the ROCKERBONE between the TUFFBOLTZ/washer and the frame, with the thicker end toward the front of the bike.
3) With belt/chain engaged with ring/cog and ready to tension, pull the wheel rearward by hand as normal until approx. 90% of desired tension with the rear axle perpendicular to the frame centerline.
4) Lightly torque Right/Drive side bolts until Rocker stays in position (approx. 8Nm).
5) Pull the Left/Non-Drive side Rocker an additional 5mm rearward, displacing the wheel slightly to the left of frame centerline, and tighten bolts enough to prevent further movement (approx. 12Nm).
6) Using a 19mm open wrench or an 8mm hex wrench on the Right/Drive side ROCKERBONE, rotate the tool downward (clockwise) until desired belt tension is reached. Torque bolts to 25Nm/18ft-lbs as specified by Paragon Machine Works.
7) If necessary to center the wheel, follow the same procedure on the Left/Non-Drive side ROCKERBONE, rotating the tool downward (counter-clockwise) until the wheel is centered. Torque bolts to 25Nm/18ft-lbs as normal.
ROCKERBONE KIT INCLUDES
::: 2x) PDX TI RockerBones (black or silver)
::: 4x) Stainless Steel M8 Recessed Washers
-or-
::: 4x) 6/4 Titanium M8 x 1.25 x 18 socket head bolts
MATERIAL: Cast Aluminum
DIMENSIONS: 68x19x9 mm
WEIGHT / STAINLESS BOLTS: 85g
WEIGHT / TITANIUM BOLTS: 66g
For more information about Rocker-style dropouts, please consult Paragon Machine Works.