FREERDNG BBSHD 130BCD Chainring Set

The spider is the part that matters. It slides onto the BBSHD output and presents a standard five-bolt 130BCD face, the same pattern road cranks have used for decades. The ring on it is CNC machined from 7075-T6 alloy, the harder of the two common aluminium grades, with a 6061 alloy part making up the rest of the set.

Gear speed is simple arithmetic: cadence times gear ratio times wheel circumference. The figures assume a steady 90 rpm on an 11T cog, which is a comfortable spin for most riders.

Those are the speeds your legs and the motor share at that cadence. Whether the motor can hold them depends on pack voltage, wind, rider weight and local speed rules, so treat the upper rows as ceilings, not promises.

• 50T–52T: fast commuting on 48V with occasional rollers.
• 54T–56T: 52V builds on long, flat highways and bike paths.
• 58T–60T: flat-country speed builds with big wheels and a rider who spins hard.

This is the trade the FREERDNG set asks you to make. On the flat, a big ring lets the motor run near its efficient speed while the bike moves fast. On a climb, it pulls crank cadence down, and the rider feels the bike bog while the motor casing warms.

Heat soak builds quietly. A 20-minute climb on a big ring can push the controller into its thermal cut-back, where power drops until things cool. The nylon primary gear inside the drive also sees its highest loads in exactly this situation, low speed and high torque, which is why it tends to wear on heavy, tall-geared builds. Match the symptoms against the nylon gear and clutch guide.

1. Shift to your largest cog before the grade, not halfway up it.
2. Keep cadence up by pedalling with the motor rather than coasting on throttle.
3. Drop the assist level on long climbs so current stays moderate.
4. Watch for a sudden power sag, the sign the controller is protecting itself.

For a rider on flat roads, none of this bites. The set suits prairie commutes, coastal paths and long rail trails where the motor spends its day at steady cruise.

Start with the right tools on the bench. A crank puller that matches your crank arms, hex and Torx keys, a torque wrench, medium-strength threadlocker, a chain tool and a quick link cover the whole job. If the arms have never been off, the BBSHD install guide takes you through the puller work.

1. Remove the drive-side crank arm with the puller.
2. Unbolt the stock ring and pull it off the splined output.
3. Slide the spider on, fit its retaining bolts with threadlocker and torque them evenly in a star pattern.
4. Bolt the ring to the spider's five arms, again in a star pattern.
5. Refit the crank, then lengthen the chain for the bigger ring.

Chain length is the step riders skip. As a rule of thumb, add about one inch of chain, one inner-plus-outer link pair, for every four teeth you add. Going from 46T to 56T means roughly two to three extra link pairs, then confirm with the big-ring, big-cog check your derailleur maker describes.

Chainline and clearance

A 56T or 60T ring is wide in diameter, and on some frames it comes close to the chainstay or a kickstand plate. Spin the cranks slowly by hand and look for rub before the first ride. Measure chainline from the frame centre to the middle of the ring; it should land close to the centre of your cassette, which for a typical 135 or 142 mm rear end sits near 50 mm.

A few routes sit either side of it. The IQ Labs spider gives you the same 130BCD face in stainless steel without a ring, so you can bolt on any road ring you like. The alltoo set covers the same big-ring territory with a colour choice. At the other end, 104BCD adapters and direct-mount rings bring the gearing down for trail and cargo work.

• Want the tallest possible gear: this set or the alltoo 130BCD set.
• Want to choose your own road ring: the IQ Labs 130BCD spider.
• Want a mixed-use gear with built-in offset: a 42T direct-mount ring, compared in the chainring and chainline guide.

Pin down three facts about your bike first. Confirm the motor is a BBSHD and not a BBS02, since the spider will not cross over. Decide the tooth count from your flat-road cruising speed, not your dream top speed. Then check chainstay clearance with a ruler, because a 60T ring needs room that some fat and step-through frames never had.

Chain retention is the last check. The narrow-wide teeth hold the chain on over bumps, but a ring this size has no chain guard, so trouser legs need a strap. On a 1x drivetrain with a clutch derailleur, drops should be rare as long as chainline stays close to the cassette centre.