The Fox Factory Race Series 2.5 x 2.0 Bump Stop Eye-Eye Mount (part 981-25-048) is an off-road bump stop from Fox's Factory Race line, designed to manage the final stretch of suspension travel before a shock bottoms out. The manufacturer says the line was developed with top off-road racing teams to give precise control over the last few inches of travel. The 2.5-inch body and 4130 chromoly shaft are built on Fox's hydraulic platform, with a Cerakote ceramic finish over zinc plating. A basic rubber or foam stop can't match that kind of controlled engagement on rock crawls, high-speed desert runs, or heavier rigs.
The real case for this part is serviceability. The manufacturer states the unit can be rebuilt by its owner and uses JM92 MIL-SPEC oil developed for off-road racing. Black anodized CNC-machined aluminum components round out the build. When a cheaper stop wears out or gets damaged, you replace it. A rebuildable Fox unit lets you refresh the seals and fluid, which is what justifies the higher price over a sealed alternative. Buyers searching for a 2.5 bump stop eye-eye mount, a 2-inch travel Fox bump stop, or a rebuildable hydraulic bump stop for a 2.5 coilover setup will find this part fits that profile.
Before ordering, confirm that the eye-eye mounting and travel match your suspension geometry and clearance. Fox provides a vehicle fitment lookup on its site for this part. Owners on user forums describe the disassembly and reassembly as manageable with a detailed guide and the right tools, and some send their units to Fox for rebuilds rather than doing the work themselves. Plan for a proper install sheet and torque specs before you start.
The manufacturer describes this unit as owner serviceable and rebuildable. Its owner's manual covers tuning, installation, and general maintenance, so check the manual for the correct procedure and fluid before opening the unit.
The manufacturer specifies JM92 MIL-SPEC oil, which it developed for off-road racing. Confirm the fill quantity and service interval in the owner's manual before refilling.
The manufacturer offers a "check fitment" tool where you enter your vehicle. Check the eye-eye mount and travel against your suspension clearance before ordering.
The manufacturer publishes installation instructions for this bump stop, so review the install sheet before you start. Owners on user forums say the disassembly and reassembly are doable for a home mechanic with a complete guide and basic shop tools, though some prefer to pay Fox to rebuild the unit. Measure the bump stop position against your shock and suspension clearance before final assembly, and confirm the mounting hardware and torque specs against the manufacturer's documentation.
