Bafang Ultra Fat 130BCD Spider + 40t Chainring w/guard

Sale price £54.00
Sale price £54.00
Shipping: Leaves within 6-7 business days


Boost Chainring For Bafang Ultra Motor equipped Ultra bikes

Technical Specifications

Number of Teeth


Chainring BCD

130mm 5-Bolt




Yes - Offset


Bike Name Compatible
Juggernaut Ultra FS / FS Pro 2/3
Juggernaut Ultra FS Pro 1 26x4" Version
Juggernaut Ultra FS Pro 1 27.5x3" Boost Version
Monte Capro Ultra (26x4.8" Version)
Monte Capro Ultra (27.5x2.8" Boost Version)
Monte Capro Lite (All Versions)
Juggernaut Ultra Beast 1/2
Juggernaut Ultra Eagle 1
Juggernaut Ultra Eagle 2
Juggernaut Ultra 1000 Series
Juggernaut Ultra Duo 1/2/3/4/Pro
Other Biktrix eBikes

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Customer Reviews

Based on 1 review
Ron Whicker
Ultra ChainRing - 40 Teeth

Easy to install. Installed as is the chain rubs against the tire when shifting into the 4 lowest gears. Support suggested adding spacers, still working on that. It lowers the gears to help me ride at a more similar cadence as my mountain friends, but it is still geared much higher than a standard mountain bike. I am also worried about blowing out the freehub with the extra torque capability.