IQ Labs BBSHD 130BCD Chainring Spider

The spider is stainless steel, which is harder than the aluminium most adapters use. That matters on a motor that puts out far more torque than any rider's legs. Bolt holes in soft alloy spiders can ovalise over time under repeated hard launches; steel resists that wear better and adds a few grams.

At 4.8 oz, the penalty is small. The kit is complete for mounting, too: five chainring bolts to hold the ring and one spacer washer for chainline tuning. The ring itself is the one thing missing, and that is the point.

• Road ring reuse: a spare 50T or 52T from an old road crankset.
• Narrow-wide 1x rings: 130BCD single rings built for gravel bikes.
• Single-speed rings: thick-tooth rings for hub-gear builds.
• Big speed rings: 54T–60T rings for flat-country cruising.

It also keeps a build future-proof. If you move from a flat commute to a hilly one, or from a 48V pack to 52V, the ring changes while the spider stays. Rings from different makers bolt to the same five arms, so wear parts stay easy to find years later.

That flexibility suits the builder who already knows which ring they want. If you do not, a complete set like FREERDNG's or alltoo's saves a step.

Know which motor sits in your bottom bracket first. The motor casing carries a label with the model name, and there are physical tells as well. The BBSHD is the larger, heavier unit rated at 1000W, while the BBS02 is the 500W–750W unit with a smaller housing.

1. Read the sticker on the motor body for BBSHD or BBS03 (the same motor family).
2. Check the kit's original paperwork or controller label for a 1000W rating.
3. Check the purchase record or the builder's notes for the kit name if the sticker has worn off.

Heat handling, gearing and the rest of the split between the two motors sit in the BBS02 vs BBSHD comparison. If the motor turns out to be a BBS02, look for a 104BCD adapter that names that motor specifically.

One more check: the spider replaces the stock ring entirely. The old ring does not bolt onto it, so budget for a 130BCD ring in the same order if you do not already own one.

The BBSHD's stock ring sits well outboard, which is fine on wide rear ends and awkward on narrow ones. A flat 130BCD spider changes where the ring sits relative to the stock position, and the included spacer washer lets you nudge it by a small amount. Where you land depends on your frame, your ring's own offset and the rear spacing.

Those are ballpark figures; cassette position varies by hub. Measure from the frame's centreline to the middle of the ring, then compare with the middle cog.

1. Mount the spider and ring loosely and measure.
2. Add or remove the spacer and measure again.
3. Shift through the cassette on the stand and listen for chain noise at each end.
4. Tighten everything with threadlocker once the chain runs quietly in the middle gears.

Get it wrong and the symptoms are easy to hear. A chain that grinds on the largest cogs, skips under throttle or rubs the ring's teeth sideways is running at too sharp an angle. With a single ring and a wide cassette, a small error shows up at both ends of the range, so aim for the middle.

Fat bikes are the hardest case. Why 100 mm and 120 mm bottom brackets shove the chainline outboard is in the BBSHD fat bike guide.

That rules the IQ Labs spider out for steep trail and cargo builds, where 32T–38T rings keep the motor spinning and cool. It points the part squarely at road, gravel and fast commuter bikes. Within that range, choose by the speed you cruise at, not the speed you might hit downhill.

• 39T–42T: city riding with hills, heavy riders, 48V packs.
• 44T–48T: close to stock gearing, mixed commuting.
• 50T–60T: flat, fast routes on 52V, where the motor rarely lugs.

Narrow-wide profile is worth paying attention to. A 1x drivetrain has no front derailleur to keep the chain on, so a narrow-wide ring does that work. A plain road ring with shift ramps will drop chains over rough ground.

Tooth count also changes chain length. Add roughly one link pair for every four teeth you go up from the stock 46T, or remove one for every four you go down, then confirm with your derailleur maker's big-big method.

Installation follows the usual spider routine: crank off with a puller, stock ring off, spider on with threadlocker, ring on with the five included bolts in a star pattern. The chainring guide compares this route with direct-mount offset rings, which skip the spider entirely.