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Our go to rim

Phase30 Rim

Phase 30 Rim Mountain Bike Wheel 27.5" 29" Rim Chromag Bikes
Phase 30 Rim Mountain Bike Wheel 27.5" 29" Rim Chromag Bikes
Phase 30 Rim Mountain Bike Wheel 27.5" 29" Rim Chromag Bikes
Phase 30 Rim Mountain Bike Wheel 27.5" 29" Rim Chromag Bikes
$172.00 Sale Save
Size 27.5

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Our go to wheel with a thick bead wall, welded joint and premium alloy

☛ Thick bead wall to prevent pinch flats
☛ 30mm internal width
☛ 32 spoke
☛ Welded joint
☛ Orientated spoke bed

☛ Rims sold individually.

☛ Premium extruded aluminium
☛ Fusion welded joint, seam ground finish


Material // Premium extruded alloy

Finish // Fusion welded seam-ground finish

Profile // Internal bracing profile / Impact resistant design

Tubeless // Tubeless Ready

Rim Weight // 27.5: 545g / 29: 584g

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.
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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.


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

Chromag rims are built on this foundation

key features

Let's get you rolling

Oriented Nipple Bed

The Phase30 and BA30 feature an oriented bed to help align the nipple seat with the angle of the spoke. This helps reduce stress on the nipple and spoke, thereby creating a stronger wheel.

Robust Beadwall

All our rims are all made from premium grade aluminium. They are extruded to our unique design and refined ERD (Effective rim diameter) for the best tire fit and hold.

The BA30, Phase30 and Ally have a robust beadwall to add increased dent resistance and tire retention.


The Phase30 and BA30 use 6069, this has a higher tensile and fatigue strength along with increased fracture toughness. It is also a bit more expensive.

The Ally uses 6061, whilst still a premium alloy it is slightly lower strength than 6069. As such more is used to compensate making the Ally slightly heavier.

Rim FAQ's

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.

Wheels come pre-taped with tubeless valves installed.

All you need to do is install tires and sealant.

Our wheels are pre-stressed and ready to ride out of the box.

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.

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. 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.

Customer Reviews

Based on 15 reviews
Cody B.
Phase 30 front wheel

An excellent addition to the phase 30 rim I had laced up a while back. Great quality and looks sick!

Alasdair C.

Phase30 Rear Wheel

Brian W.
So good, I put that sh*t on everything.

Been running Chromag wheels on every rig for a better part of a decade, super reliable, super strong!

Brent H.
Solid Rims

Phase 30 rims build up really nice, not the lightest but not the heaviest either. Certainly tough. Amazing for the price.


Honestly, these rims have been great over the past year I have owned them. Usually, I manage to go through 2-3 high-quality allow rims a season. Not these. They have only been trued once and are still holding strong. Definitely at the top of my list when looking at higher-quality alloy rims.

Solid mid-weight wheel

I switched to these, coming from a Stans Flow wheelset and have been impressed.
Rims: Coming from the Flow, There was a huge difference in the sidewall thickness, and these have been very resistant to denting. The finish is consistent, round and true out of the box. Setting up tubless was a breeze. Tire fit was what I'd expect them to be and they inflated, sealed and seated nicely. I suppose if you are hard on rims, you could go to the heavier BA version, but on my 140mm bike, these are great all around.
Hubs: These are not the highest engagement, but they are solid and chunky. I climb a lot and these engage well and I've never noticed a single slip. They are easy to rebuild and I noticed that they use much larger bearings than my last hubset which wasnt so reliable.
Build: These are wll built and come true and round out of the box. They do need re-tensioning after a half-dozen rides, but overal have been easy to keep running straight.
This is a great wheelset for the price!


Awesome wheelset for the price! Not a ton of use yet but a great upgrade for my wife's bike!


Awesome wheelset for the price! Not a ton of use yet but a great upgrade for my wife's bike!