27-27.5mm external 50mm depth Rim Brake rims or wheels?

[Mocs123]

Are there options for 27-27.5mm external width, 19mm interal width, RIM break wheels or rims? I'm looking for 50mm deep rims or a built wheelset. I'm looking for rims ~450g each or a built wheelset ~1350g. It seems like everything I can find is either 26mm wide or 28mm wide and the 26mm wide is too narrow for 25mm tires and the 28mm rims are too wide for my brake calipers.

If I buy rims only, I would have them built by a local wheel builder, probably with Carbon-Ti hubs.

Am I looking for a unicorn? It seems like there would be something out there.

[AJS914]

Chasing the perfect aero optimized rim/tire is difficult especially if you have an older frame and rim brakes.I suppose the 26/28mm rims you are looking at are the Farsports Kaze?

I have Farsports 25mm wide rims, 18mm internal, and with 25mm GP5000s you can barely tell that it isn't perfectly aero optimized. I think the tire measues 26mm so it hangs over 1mm on each side.

With aero optimization you are only talking about a watt or two anyway. I'd look at those 26mm rims and use a true 25mm tire like the GP5000. You'll be super close.

Personally I wouldn't even want something like the Knot wheels that are super wide (32mm) with a recommended 25mm tire. If you get a blowout, you might be quickly riding on carbon.

[Mocs123]

I currently have a set of iCan Aero 40's that are are 25mm wide external (18.4mm internal) and am using GP5000's that measure about 26.3mm mounted. I'm about to change tires to a new set of GP5000S-TR and go tubeless for the first time. I had to replace the rim tape on the front wheel and used fabric rim tape so I need to replace it prior to going tubeless and was looking about a little wider and deeper rim.

It may not be worth changing wheels at all, but I'm always looking for speed, even when it's probably only a placebo.

[AJS914]

Get an aero helmet or tight race-fit jersey - way cheaper than new wheels.

[Hexsense]

riding on carbon in a case of flat is actually hard to happen if you use tire like Vittoria Corsa.
The tire actually get wider when it is deflated.
like, 23mm tall 26mm wide when pumping up turn into 5mm tall, 33mm wide when flat.

Different tire deflate into different shape though. But you can definitely get 105% without riding on carbon rim when flat.

[mag]

Not many options I'm afraid. What can come close:
- Boyd 44 mm, 19/27 mm wide, but they're quite heavy at claimed 485 g per rim (I've got older version of these and would definitely like to shed some weight here)
- (now discontinued) Bontrager Aeolus XXX 4 TLR, 47 mm, 21/27 mm wide, approx. 1400 g for the wheelset

I've been looking for similar rims for some time (not a high priority for me though) and will probably settle for some Chinese (Farsports, Carbonbeam etc.) 21/28 mm ones depending on the lightest ones available when I decide to go ahead with the purchase.

[PoorCyclist]

Just my opinion going beyond 26/27mm brake track is a little problematic, I am using dura-ace 9100 brake calipers which I don't think it's not that outdated, they have updated it to clear 28mm tires but the brake pads are still like this / \ . I set the pads while clamped on the rim but you can see the arms of the caliper and cable are not in the most optimal position, like you have opened the caliper too far. Just had to wait a bit for the pad to wear to get better contact with the track.

That said my tire is 25mm wide and the rim is 26.5mm (bora) which fits 105% rule.

Just be careful when it's 105%, I'm pretty sure you can scratch or mess up your rim if you carry your bike too close to stairs or curb and make contact.. (to put in automotive terms "curb" it) which otherwise does not happen when the tire is fatter than the rim.

[Mocs123]

@mag - Thanks for the heads up on the Bontrager XXX 4 TL4 as they were not on my radar at all. I managed to find a set for a fair price on ebay so I'm going to try them out.

We will see how it goes. I'm sure with the new wheels I'll be asked to join a world tour team in a few weeks! (well at least I'll look pro).

[CoffeeNdonuts]

I’m pretty sure the Bontrager XXX4 are 21/28mm, 47mm deep.
The ones that will match your widths are the Bontrager Aeolus 5 TLR ( previous model to the XXX4’s).
The Aeolus 5 are 19mm internal and 27mm external, 50mm deep.

[warthog101]

Rim: 19mm internal, 27.5mm external, 50mm deep

https://www.wiggle.co.uk/prime-rr-50-v3 ... ess-bundle

I have a pair. I prefer them to my firecrest 404s.

Can't beat the price either.

Out of stock at the mo though.

[mag]

Aeolus XXX 4 TLR have claimed outer width 27 mm. See the FAQ section at https://www.trekbikes.com/us/en_US/equi ... l/p/21817/
Most shops mention 27 mm width, few 27.5, but none 28, so I tend to believe they could really be 27 mm wide, 27.5 max.

Those Prime wheels from Wiggle would fit too, but they're even heavier than Boyd 44s it seems.

Unfortunately there aren't many rims with external width in the 27-27.5 mm range and I haven't found anything acceptably light besides those Bontragers which aren't made anymore (but one might be lucky to find them somewhere).

[Mocs123]

Per Bontrager the XXX 4 TLR is 27mm wide and the XXX 6 TLR is 28mm wide. We will see if they fit OK as they are supposed to be here tomorrow and I already have a new pair of 25mm GP5000S-TR's ready for them. I do have to pick up some valve stems and orange seal. This will be my first foray into tubeless.

Of course then I need a good dry clean day to go test them out as I keep the Wilier Zero.7 I'm mounting them on for fair weather days only. The disc brake Trek has been seeing most of the use lately!

[Jabulane]

Check out Caden Carbon out of Australia. They have options very close to the specs you are looking for. Also... Excellent wheels and customer service.

https://carbonbikewheels.com.au/us

[Mocs123]

I'd never heard of Caden - Thanks for bringing them up.

[mag]

Also if you live in the UK you may check out this wheel builder: https://zedbikewheels.com/shop/
He uses some Chinese rims with 18/27 width, but I think they're quite narrow either due to the inner width as well as because they're only 25 mm at the brake track.