Endless 90 & 100 Ultra UFS Setup Guide

This guide explains how to properly mount and align your new Endless 90 Ultra UFS or 100 Ultra UFS frames to you boot, and how to install the aluminum Ultra Axles. Special attention is required when using aluminum axles in aluminum frames so please read the instructions below carefully.

Frame Mounting

We include four (4) pink Ultra Washers for frame mounting. These should be installed under the head of the frame mounting bolts that came with your boots before you torque down the bolts. Washers are important for distributing the load of the threaded fastener. The bolted joint will have its best performance when washers are used.

UFS (Flat Mount)

The short slots in the frame allow for a centered mount at one end, and up to 3 mm of rear bias at the other. This adjustment range allows you to optimize the location of the middle pivot points relative to the anatomy of your foot. To center the frame on your UFS boot slide the frame fully forward, toward to the front of your boot.  To bias the frame 3 mm towards the rear, slide the frame fully toward the heel of the boot.  To be clear: centering the frame mounting bolt in the slot does NOT center the frame. 

IMPORTANT: The rear of the frame is marked "endless".  The front of the frame is marked "90 ULTRA" or “100 ULTRA”.  Do not be the person that posts their new setup to Reddit or Instagram with the frame installed backwards.  Also, if you intend to remove a sole plate from your boot and mount directly to the boot (e.g. Seba SX/CJ), then may need to obtain shorter frame mounting bolts. Be sure to verify that frame mounting bolts don’t protrude into the liner.

THEM 909 owners: You may need to replace you frame mounting bolts with non-shouldered M6 bolts.  We've seen stock frame bolts from THEM that have a shoulder that does not conform to the UFS standard.

Standard Omni owners: Do not install the frame bolts supplied with your skate without using the pink Ultra Washers that are included with your new frame. The head of the bolt does not sit flush against the frame due to a slight taper at the base of the bolt shaft.

The following pic shows where the frame bolt would be for a centered mount.

Ultra Axle Installation

Each Endless 90 Ultra and 100 Ultra UFS Frame set includes eight (8) aluminum Ultra Axles. These high performance axles provide about 40 grams of weight savings per skate compared to steel axles. Some frame sets will include Titanium Gray axles and others will include Cyberpunk Pink axles. Refer to the product pages for colorway details.

Special attention must be paid when installing these axles. Aluminum axles tend to be self-locking when used in aluminum frames due to a phenomenon called galling. High friction develops between the two parts which keep the axles from backing out during skating. However, the downside is that if they are over-tightened, they can get stuck. Please read the following instructions carefully.

Axle Installation

1. Prior to wheel installation it's good to verify that all axles can be fully threaded by hand into each threaded hole in the frames. If the axles gets stuck when threading by hand, stop and inspect the threads for damage or burrs. Never use a tool to force an axle. Each axle should smoothly thread in by hand without tools. By forcing the axle you risk damaging the threads. Please contact us if you notice any issues.
2. Slide the wheel into the frame channel.
3. Align the bearings, spacer, and frame hole using a skate tool or a wooden pencil (see video).  We recommend the Sonic Sports skate tool, which has a bearing alignment feature.  When all these features are aligned, it will make inserting the axles much easier.
4. By hand, carefully start threading the axle into the frame.
5. Use a skate tool to continue installing the axle. Turn lightly until the axle stops spinning freely. Once it stops turning easily, snug the axle no more than an extra 1/8th turn (see video on our Instagram and YouTube channel).  Do not over-tighten. This could result in the axle getting stuck. Stripped or stuck axles are not be covered by product warranty.
6. Do not use power tools to tighten the Axle Screws. Repeat for each wheel and axle.

Note: when removing axles it's not uncommon to hear a "screech" or "pop" sound as you overcome the friction in the threaded joint.

Wheel Rotation

Wheel wear will always be unique to the way each individual uses their skates, and no two skaters will ever have wheels that looks the same after skating the same distance.  The goal is to rotate wheels so that a consistent rocker and edge wear pattern is maintained before needing to replace the wheels.  The more often the wheels are rotated, the more consistent the feel of the rocker will be between rotations.  We recommend one of the following wheel rotation schemes:

1. Flip each wheel in place to wear inside and outside edges evenly.  This scheme may slightly exaggerate the rocker over time, as most skaters tend to wear their outer wheels more heavily.
2. Swap 1L (front left) with 3R (3rd right) and flip; swap 1R with 3L and flip; swap 2L with 4R and flip; swap 2R with 4L and flip.  This scheme will balance wear between left and right frames, and between the front and back of each frame.