Wren Star Ratchet Rear Hub (190mm/197mm)

Sale price £271.00
Sale price £271.00
Shipping: Leaves within 6-7 business days


Upgrade your eBike's drive system with a star ratchet hub manufactured by Wren Sports. Designed to excel in high-torque situations with powerful mid-drive motor eBikes. Available in 32 hole and 36 hole variants and can be set up for 190mm or 197mm rear-ends.

This bundle includes the hub, adaptor to fit your hub spacing and axle type (if applicable) and 40 Uncut 14G Spokes and Spoke Nipples.

What is a star ratchet hub?

A star ratchet hub is a robust and reliable hub design which distributes the load of your eBike's motor across 36 points-of-contact opposed to the 4-6 points-of-contact on a pawl based hub.

This addresses a common point of failure for many regular hubs where the pawls will break or strip the race in the hub causing the power to no longer be transferred to the rear wheel. The even distribution of power between the star ratchet teeth ensures a smooth and reliable drivetrain.

No Tool Construction

The star ratchet hub can be assembled and disassembled with no tools, resulting in easy access to bearings, freehub body replacements,  and configuration between 190m and 197mm.

Technical Specifications

Axles Supported

12mm Thru Axle (5mm QR if purchased with Adaptor)

Spokes Included

40 Uncut, 14G Spokes and Nipples Included


HG Style

Cassette Compatibility

9, 10, 11 Speed


Adjustable Between 190mm, 197mm

Spoke Hole Count



Bike Name 36 Hole 36 Hole with 5mm QR Adaptor
Juggernaut Ultra FS
Juggernaut Ultra 1000 w/Rear Thru Axle
Juggernaut Ultra Duo 2 Step-Over
Juggernaut Ultra FS Pro 2/3
Juggernaut Ultra FS Pro 1 26x4 Fat-Tire Version
Juggernaut Ultra Beast 1/2
Monte Capro Ultra 1/2 26x4.8 Fat-Tire Version
Juggernaut Ultra Duo 3/Pro/4
Juggernaut HD Duo
Juggernaut Ultra FS Pro 1 27.5x3 Boost Version
Juggernaut Classic Duo
Monte Capro Ultra 1/2 27.5x3 Boost Version

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Customer Reviews

Based on 20 reviews
B sting
Wren star ratchet rear hub juggernaut FS PRO

Get one when you order your bike, the 1,000 Watt motor will wear out the original one in about 600 miles or so, and this may depend on the type of riding you do. I ride off road up and down mountains. They got me a new hub and wheel in about a week. Thanks bike people for getting the parts that I need to the USA, asap. 😊✌️🤙

Martin Robinowich

So far the Wren Ratcheting freehub seems rock solid. If I had known the standard freehub would fail, I would’ve ordered it as an upgrade when I ordered my Jugg Ultra Duo.

Todd Cuthbert
Great rear hub

Received my new rear hub and first thing I noticed was it appeared to be a far superior hub than the original rear hub that comes on the bike. Installs was a bit challenging as there were a couple extra parts (I come to realize they were different size spacers) and no directions as to what they were for. But after figuring it out and changing to the proper spacer it went together easily. Been back riding for over a week now and definitely rides smother and fixed my grinding issue from the bad hub I had. Thanks to the team for getting the part out to me quickly, so I had minimal down time.

Thomas Marsh
Wren Star Ratchet rear hub

After 7800 miles my original hub finally stripped out from years of rough desert trails. I was excited to find out that Biktrix had a much superior rear hub for replacement. I ordered the hub, with new spokes and new rim, all put together by Biktrix for a great price. The new Ratchet hub sounds and performs great. Now I am back climbing mountain trails again.

Tim Crawford
Good upgrade

Blew out my original hub. Got the Wren star ratchet hub. Had a good bike shop install it with new spokes and a new tire set to boot. The mechanic commented on the quality of the hub and said I’ll probably never have another blow out. I was nervous about the fit but Biktrix had me send photos and measurements and everything fit fine.

John Murphy
Wren hubs

Wren hubs are the way to go with powerful e-bikes.

John Murphy
The WREN HUB is the way to go.

I’m in my 5th year riding my Ultra. I have broken by stock hub by Oliver stressing it. The prawns can’t take my power and the 1,000 watt motors after a few hundred hard claims. So for peace of mind I bought the WREN. Now I think it’s in breakable. They have 20 teeth where the stick buns have 6 prawns. If you are a hill climber I think you should consider it.

8000 w

200 Amps down low, this Wren Kit is Fn crazy strong ...

Darrin Director
DIY 6KW MidDrive Motobecane Sturgis Bullet FatBike

Excellent. I had a local Bike Shop Owner I've known for years restring rear wheel with you Wren Hub. I have literally torn to shreds 3 different high end sram HD Hubs and again after rebuild etc. This hub really pull alot more than it's own weight. I've applied up to 5000W or roughly 6 horse power in 6th gear that's about a 12/36/44 tooth ratio...bottom line 150lb bike 210 pound rider up to 55 miles an hr short burst and 40 mph steady and consistent reliable transport. Thanks for a great HUB. 👍 worth every cent...