Durable Steel Chainring for Inside Fit E-Bike Spiders.

The Burgtec 104mm BCD Inside Fit E-Bike Chainring is built for the additional torque and mileage of electric mountain bikes. Its steel construction prioritises durability, while the Thick Thin tooth profile helps keep the chain securely engaged over rough trails.

This listing is for the 32T Inside Fit version. Compatibility must be checked carefully because a 104mm BCD spider may position the chainring on either side of its mounting tabs.

Compatibility

• Fits compatible four-bolt 104mm BCD e-bike spiders
• Inside Fit design mounts on the inner side of the spider tabs
• 32T tooth count
• Designed for single-chainring e-bike drivetrains
• Works best with a clutch-equipped rear derailleur
• Not suitable for spiders requiring an Outside Fit chainring
• Not suitable for Shimano motor systems, which use Burgtec’s Outside Fit version

Check the existing chainring position, bolt-circle diameter, chainline and available frame clearance before ordering. Do not choose solely by the motor brand, as spider designs can vary between bikes and model years.

Inside Fit Mounting

Inside Fit means the chainring sits against the inner face of the spider’s mounting tabs. Fitting the wrong version can move the chainline inboard or outboard, which may cause drivetrain noise, poor chain alignment or clearance problems.

If you are uncertain, compare the new ring with the original chainring or ask our workshop to confirm the fitting from clear photographs of the crank and spider.

Thick Thin Tooth Profile

The alternating thick and thin teeth match the different spaces inside the chain links. This provides more secure engagement than a conventional derailleur chainring and helps reduce dropped chains on rough terrain.

Correct chain length, chainline and drivetrain condition still matter. Replace a worn chain at the appropriate time, as fitting a new chainring to a badly worn drivetrain can lead to noise or poor running.

Steel E-Bike Construction

Steel is heavier than aluminium but provides better durability under the repeated loads produced by an e-bike motor. This makes the ring a sensible choice for riders who value service life over saving a small amount of weight.

Key Features

• E-bike-specific steel construction
• Four-bolt 104mm BCD mounting pattern
• Inside Fit chainring position
• Thick Thin tooth profile improves chain retention
• Durable black finish
• Required mounting bolts included

Our Thoughts

This is the ring to choose when your e-bike uses a four-bolt 104mm BCD spider with the chainring mounted on the inside. The steel construction adds some weight, but durability is usually the more important consideration on an e-bike.

The part we would double-check is the fitment. Looking at where the current chainring sits is more reliable than ordering by motor brand alone.

Specifications

• Brand: Burgtec
• Product: 104mm BCD Inside Fit E-Bike Steel Chainring
• Product code: 8601
• Mounting pattern: Four-bolt 104mm BCD
• Fitment: Inside Fit
• Size: 32T
• Material: Steel
• Tooth profile: Thick Thin
• Colour: Burgtec Black
• Required bolts: 8mm × 0.75mm × 8mm
• Mounting bolts included: Yes
• Intended use: Electric mountain bikes