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BA30 Rear Wheel

BA 30 Rear Wheel MTB Mountain Bike Wheels Chromag Bikes
BA 30 Rear Wheel MTB Mountain Bike Wheels Chromag Bikes
BA 30 Rear Wheel MTB Mountain Bike Wheels Chromag Bikes
BA 30 Rear Wheel MTB Mountain Bike Wheels Chromag Bikes
BA 30 Rear Wheel MTB Mountain Bike Wheels Chromag Bikes
featured
BA 30 Rear Wheel MTB Mountain Bike Wheels Chromag Bikes
BA 30 Rear Wheel MTB Mountain Bike Wheels Chromag Bikes
BA 30 Rear Wheel MTB Mountain Bike Wheels Chromag Bikes
BA 30 Rear Wheel MTB Mountain Bike Wheels Chromag Bikes
BA 30 Rear Wheel MTB Mountain Bike Wheels Chromag Bikes
BA 30 Rear Wheel MTB Mountain Bike Wheels Chromag Bikes
featured
BA 30 Rear Wheel MTB Mountain Bike Wheels Chromag Bikes
$584.00 Sale Save
Size 29
Driver Body XD

Item is in stock Only 0 left in stock Item is out of stock Item is unavailable

☛ Complete wheels are setup for tubeless with tape and valves installed.
☛Your choice of XD, MS, or HG Driver Body

Rim Specs

Material // Premium extruded alloy

Finish // Fusion welded seam-ground finish

Profile // Internal bracing profile / Impact resistant design

Tubeless // Tubeless Ready

Rim Weight // 27.5: 611g / 29: 624g

Internal Width // 30mm

Valve // Presta

Max Tire Pressure 2.4" // 45PSI

Max Tire Pressure 2.8" // 30PSI

Max Spoke Tension // 125KgF

Build Info // 27.5" ERD: 566mm / 29" ERD: 604mm

Hole Count // 32

Click here to view the wheel user guide.
featured

Hub Specs

Axle Diameter // 12mm

Spacing // Boost 148mm

Driver // XD, HG or Microspline

Engagement// 4-Pawl, 36 Point

Spokes // 32

Disc Mount // 6 Bolt

Click here to view the wheel user guide.

Questions?

Don't hesitate to reach out with any and all questions!

Contact Us

Worldwide shipping

We ship anywhere in the world with competitive rates from UPS and FedEx. Alternatively you can pickup right here at Chromag HQ.

Service Guide

Need more info on setup, service and spare parts?

Check out our user guides here.

Warranty

All of our parts are backed by a 1 year warranty.
After that we still have your back with our crash replacement program.

key features

Design Considerations

Build Quality

Our wheels are built with longevity in mind. We have refined both the construction and build to minimise the re truing needed after the first few rides.

We achieved this with multiple pre-stressing and re-tensioning operations so you can spend more time on the trail than in the truing stand.

Oversize Ratchet Ring

The R4 is designed around an oversized ratchet ring, reducing torque on the engagement assembly & thereby improving life span.

This has the added benefit of providing space for larger bearings, which also increases time between service intervals.

Tubeless ready

Wheels come pre-taped with our black, Presta tubeless valves installed.

All you need to do is install tires and sealant.

Nylock spokes

Nylock spokes prevent any unwanted rotation between the spoke and nipple.

We find it a more reliable long term solution than thread lock or spoke prep as the spokes can be adjusted multiple times and the nylon patch does not degrade.

Brass Nipples

Brass nipples are more corrosion and fatigue resistant, allowing adjustment of spokes as needed for a long time to come.

While alloy nipples are lighter and work well in the short term we don't think they are a good fit for a long term wheel solution.

R4 Rear Hub Parts Mountain Bike Chromag Bike Parts
Spare Parts

We have a wide variety of spare parts and bearings available for the R4 so you can fully service your own equipment at home.

The exploded diagrams are also pretty helpful if you got distracted while pulling everything apart.

Available here

Wheel FAQ's

Our wheels are pre-stressed and ready to ride out of the box. We also use Nylock spokes to keep the tension where it should be. We've found this to last longer and stay in place better when adjustments are made later on.

However, like all wheels there is a bedding-in period, so be sure to keep an eye on spoke tension after the first few rides.

Because the bike industry likes to invent new standards by the hour, there are different freehubs to choose from depending on which cassette you run.

HG is typically for older drivetrains and SRAM NX.

XD is for newer SRAM.

Microspline is for newer Shimano.

The R4 is compatible with HG, XD & Microspline, so if you do decide to change your drivetrain, all you need to do is switch out your freehub.

Available here.

Wheels come pre-taped with tubeless valves installed.

All you need to do is install tires and sealant.

If you got our wheels on a complete bike from us, tires and sealant will already be installed and seated, just inflate to desired pressure.

Provided the rim does not have a crack, you can use an adjustable wrench to gently bend it back to help your tyres seat properly. (One of the benefits of alloy over carbon)

Use a rag or an old inner tube to prevent scratching your rim, and be careful to avoid puncturing your rim tape!

You'll likely need to adjust spoke tension if your wheel has taken a hit hard enough to dent it.

Having fewer points of engagement leads to more backlash in the system, this is apparent predominantly in climbing gears and technical situations. That being said, from our experience you very quickly become accustomed to the hub you are running and it rarely crosses your mind when riding after the first ride of a new component.

The more points of engagement, the smaller the area of contact between pawls and ratchet ring, along with fewer pawls engaging at the same time. This is in order to fit more into the same space, often leading to reliability issues especially as parts start to wear.

With the R4 we have tried to strike the happy middle ground of having enough points of engagement to feel sharp but also leave room for long term reliability.

Of course there is also the topic of pedal kick back and suspension interaction, which could be a full article in itself.

To keep things simple, a higher engagement hub has the potential to give more feedback due to less backlash before it engages. In general, we think there are a myriad of more important things to worry about in how a bike rides.

If you notice any play in your wheel when your axle is tight its time to check things out. Similarly if you can hear or feel the bearings grumble when spinning, an investigation and likely fresh set of bearings would be a good move.

If you are doing a pre-season refresh or just giving your bike a thorough going over then cleaning and re greasing your freehub body is a good move, removing any contaminants and adding fresh clean grease is a good way to reduce long term wear.

All spare parts available here.

They both use our top end alloy with a fusion welded seam-ground join, and have a 30mm inner width.The main difference is the BA30 has some extra internal bracing, making it stronger and a bit heavier.If you're really on the fence, run a Phase on the front and BA on the rear.

The Phase and BA are fusion welded, and post ground which makes the join the strongest part of the rim!The Ally is pinned at the joint, which is more simple and less labour intensive, but not as strong. The Ally is also slightly heavier as the alloy used has slightly less strength than that of the BA and Phase.

Customer Reviews

Based on 20 reviews
75%
(15)
20%
(4)
0%
(0)
0%
(0)
5%
(1)
S
Scott B.
The same as I said

The same as I said for the front wheel... So far it is holding up, so the wheel itself seems to be good. We'll see how it does long term. Dropped a star due to issues with shipping and lack of attention to the rim tape, along with a lackluster response to both.

S
Steve
Does the job

I'm pretty heavy and have a habit of breaking wheels. So far these have been fantastic. Rims haven't got so much as a ding and the hubs do what they're meant to. Would recommend to a friend.

S
Stokes
BA30 wheels

Best wheels I have ever had. I've had one on my hardtail for three years and it hasn't even seen a spoke key. Also have a pair on my trail bike going strong after a year or so.

J
Joel
Nice

I built the wheels myself and got them straighter than any wheel I've seen before. So straight that when you spun them fast they looked like they were sitting still. Been bashing them hard for a year on hardtail with no problems.

S
Sam T.
The Only Alloy Rim I Trust

I run these rims on both my DH and by Enduro. I have destroyed 2 of them in about 2 years but for me that's pretty good. Neither has snapped just massive dents and a 5 spoke flat spot. These rims are insanely strong and with all other alloy rims I've tried i smash them in a ride or two. I will be a lifetime BA30 customer.

P
Paul C.
Excellent Roll Model

The BA 30’s pretty much deliver as promised. They stay true to form even after the occasional heart thumping miscalculated drop. The design feature where the rubber hits the rim is completely on point

A
Adam D.
BA30 Wheel

I haven’t gotten to ride the wheel yet but it looks solid! I’ll update the review after some park thrashing.

L
Liam

These rims have been good to me. As I am notorious for blowing through rims they have been solid so far. Touch wood!