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AASQ #155: Why cannot I’ve a street bike with rim brakes and thru-axle wheels?

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We know, there’s no such factor as a silly query. However there are some questions you won’t need to ask your native store or using buddies. AASQ is our weekly collection the place we unravel your questions – severe or in any other case. Hit the hyperlink on the backside of the put up to submit your individual query.

This week we’re turing our consideration to the asphalt, why street bikes with rim brakes and thru-axle wheels are a relatively unusual sight. To sort out the query, we now have consultants from Felt Bicycles and Argonaut Cycles. They’re:

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Why can’t I’ve a street bike with rim brakes AND via axle wheels?

Felt: One other method to contemplate this query could be to ask, “Why do street bikes have disc brakes and thru-axles”? There isn’t any technical cause why they might not have rim brakes and thru-axles or, alternatively, disc brakes and fast releases. Disc brakes with fast releases have been utilized on mountain bikes for fairly a number of years. The push for disc brakes on street bikes got here across the similar time that mountain bikes have been shifting away from fast releases and to the 142×12 thru-axle customary. Through-axles have been developed for mountain bikes, as fast releases didn’t provide a stiff sufficient interface between the wheel and body, particularly on full-suspension mountain bikes.

felt vr carbon thru axle dropouts flat mount disc brake caliper

Through-axle dropouts and flat mount brake caliper on the rear finish of the Felt VR Carbon Street Bike

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Street bikes historically used 130 OLD (the gap between the within faces of the dropouts, generally known as “spacing”) fast launch hubs, whereas mountain bikes had used 135 fast launch hubs. Whereas there have been some uncommon 130 disc hubs that have been made for some early disc street and cyclocross bikes, they weren’t ideally suited. As a result of the disc brake mounting flange occupies a considerable space, the spoke flange has to maneuver in direction of the middle of the hub, which decreases the spoke angle and the energy of the wheel. The 135 OLD width hubs are broad sufficient to help a disc brake flange and nonetheless preserve acceptable spoke angles. (Observe that 142×12 is similar 135 OLD width hub with totally different finish caps for thru-axles.)

Street bikes might have moved to 135 fast launch hubs, however as a result of mountain bikes have been already shifting to thru-axles and the entire producers have been gearing up for that, we received 142×12 as the usual for all street and cyclocross bikes. Whereas wheel modifications aren’t fairly as quick with thru-axles, they provide a way more sturdy connection between the body and wheel.

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felt vr advanced road bike review riding action

So, again to the unique query. “Why can’t I’ve a street bike with rim brakes and thru-axle wheels?” As I defined above, it’s partially about timing and performance. The timing half is that the push of disc brake-equipped street bikes got here at a time when mountain bikes had, for probably the most half, moved to 142×12. As a result of it was an current purposeful customary it was simply adopted for disc brake-equipped street bikes. The performance concern is that thru-axles by no means provided a major sufficient benefit for street bikes on their very own to trigger the trade to maneuver to it. The change needed to come together with disc brakes as the first driver.

Argonaut: From a efficiency standpoint there’s no cause you may’t run a thru-axle on a rim brake bike. It’s not just like the axle interface would impede rim braking efficiency. In reality, it will probably be an enormous enchancment.

argonaut disc road bike rear thru-axle disc brake mount

Through-axle dropouts on the Argonaut Disc Street Bike

However, nobody makes a thru-axle, rim brake hub, that I do know of anyway. I’m undecided if DT-Swiss finish caps are swappable between their TA disc hubs and rim brake hubs, however I don’t suppose so. That being stated, I can’t consider a cause you couldn’t construct up a rim brake rim round a disc brake hub. You’d have a rotor interface hanging out not getting used that will be a bit of bizarre, however that will harm something.

You’d want a customized fork, although, possibly Wound Up would make one for you? The rear spacing is simpler, however once more, you’d want a customized body that might take a 142mm x 12mm thru-axle. I guess Aaron at Mosaic would construct you one! Haha. The place there’s a will, there’s at all times a method.

argonaut disc road bike thru-axle wheels

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