Open mold wide profile carbon wheels

[Hexsense]

The actually said "the GP5000". He didn't specify a 23mm GP5000 so we really don't know what size he's refering to.

That said, most tests are using the 25mm GP5000 which measures 25mm on a 17/18mm wide rim. On the LB RR56C02 I think you'd probably want to use a 28mm GP5000. The minimum for me would be the 25mm tire.

oh wow, yeah i misread by a lot.
Sorry.

Anyway, i mount 5000 28c on the LB56 and measured it.
With picture in this thread:
https://weightweenies.starbike.com/foru ... 5#p1446818

Text only but also with width of some other tires.
https://weightweenies.starbike.com/foru ... 5#p1446820

[JohnPeopleman]

The actually said "the GP5000". He didn't specify a 23mm GP5000 so we really don't know what size he's refering to.

That said, most tests are using the 25mm GP5000 which measures 25mm on a 17/18mm wide rim. On the LB RR56C02 I think you'd probably want to use a 28mm GP5000. The minimum for me would be the 25mm tire.

oh wow, yeah i misread by a lot.
Sorry.

Anyway, i mount 5000 28c on the LB56 and measured it.
With picture in this thread:
https://weightweenies.starbike.com/foru ... 5#p1446818

Text only but also with width of some other tires.
https://weightweenies.starbike.com/foru ... 5#p1446820

Thanks Hexsense . That’s precisely what I was after. I was actually looking for widths of all tyre sizes on that rim and should have made that clear. Mea culpa.
However, what I wanted to determine was whether a 28mm was going to be wider than the rim. It seems it’s still going to be slightly wider, but do you feel it’s going to affect the crosswind stability and aero benefits?

[AZR3]

I’ve got some LB56 in order and am going to run Hutchinson 5 fusion performance tubeless ready in 25mm. I’ll update with width/psi when I get everything

[Hexsense]

I’ve got some LB56 in order and am going to run Hutchinson 5 fusion performance tubeless ready in 25mm. I’ll update with width/psi when I get everything

Great, That's the tire i'm interested if i ever go tubeless route again. Keep update.

Thanks Hexsense . That’s precisely what I was after. I was actually looking for widths of all tyre sizes on that rim and should have made that clear. Mea culpa.
However, what I wanted to determine was whether a 28mm was going to be wider than the rim. It seems it’s still going to be slightly wider, but do you feel it’s going to affect the crosswind stability and aero benefits?

That's actually the width first mount. It'll still expand by probably another mm through the rest of its life.
My preference is 25c front and 28c rear on normal road. Then 28c front also if i plan to ride roubaix or something nasty.
Unless you are competing TT, just screw 105% guide line for rear tire, and you left with only front tire to adapt to the condition IMO. Placebo or not, i think rotor choice effect cross wind more than tire choice. With Dura-ace/ Ultegra rotor especially bad with crosswind coming from left side. Sram Centerline X doesn't have such effect of fan blade rotating against the wind.

Another note, I have a chance to ride other people's narrower U shape wheel this week. Although it's a short around the park testing, it remind me of some wheel behave differ from other wheelset. My friend's wheel got handlebar rotating force with gust. My LB 56mm get push straight up side way but no handle bar rotating force. I still go straight, bike just tilt/lean underneath from pushing force. This is from almost 20 km/h steady cross wind with stronger gust.

[Marin]

Same bike?

[Hexsense]

Same bike?

Not the same exact bike, but both are Specialized Allez Sprint.
Mine is Allez Sprint Disc with LB wheelset, another is rim brake Allez Sprint.

[mesomaxl]

May I ask what wheelset people here would get for running a 28c tire with the most aero benefit?
U-Shape with 25 outer width? Or is that most likely too narrow and a 23mm inner / 30mm outer V-shape would the better choice? (which would most likely stretch the tire to 30mm external width as well).

[spud]

I can't answer based on experience in CFD or a wind tunnel. But some suggestions by people who MIGHT know say traditional (not U) shape, with 30 mm width, or as close as you can get, would work best.

[Marin]

May I ask what wheelset people here would get for running a 28c tire with the most aero benefit?
U-Shape with 25 outer width? Or is that most likely too narrow and a 23mm inner / 30mm outer V-shape would the better choice? (which would most likely stretch the tire to 30mm external width as well).

1st question is if you want a 28mm wide tire or a tire that says 28mm on the sidewall - which will be 32+ on a wide rim.

In the 1st case, you can get a 28-30mm (external) rim and mount a 23 or narrow 25 which will come out to 28mm and will still have a nice transition to the rim.

In the 2nd case - you probably won't find a rim wide enough.

[Beaver]

Cannondale Hollowgram Knot 64 are 32mm wide.

But this looks fine, the GP5000 in 28mm is narrower than the 4000S II: https://weightweenies.starbike.com/foru ... 5#p1446818

[mesomaxl]

thank you for the replies so far... my idea was to fetch a rim with 30mm external width and fit a 28c tire that fits true to size, assuming it will stretch to 30/31 anyways.
So definitely no GP4000s But a 28c GP 5000 got measured with 30.x on a 23mm internal rim-bed

[jeanjacques]

Hello,

For aerodynamic gain with a 32mm true size tire (mesured on wide rim), what is the best between a 30 external rim 40 depth and 28 external 47 depth ? The 105% rule won't be respected in any case but the Hambini study show that for the rear tire, a little overlap don't affect aero performance. So more overlap and longer depth to reattach the air flow ? Or try to keep it more stable with a low overlap ?

[Beaver]

If the tire on the front rim is wider than the rim itself, the airflow will loose contact to the rim already in low angles. The more overlap, the earlier. So both alternatives are not ideal. A 28mm GP5000 on a 30mm wide rim as seen above would be a better choice.

But again: The differences are marginal, don't expect to feel it on the road, it's more for the head.

[jeanjacques]

Thanks for your answer ! Ok ok, just difficult to give up the 32c tire for this kind of trip when there is some rough road/path. And a 33mm wide rim will be very ugly so, go back to 28c tire

[ericoschmitt]

Premium. Wanted Extralight but BTLOS said for disc brakes they don't recommend Extralight. Which kinda seemed weird to me, but...

It's probably because the Extralight is more fragile around spokes, and disc brakes add tension when you brake hard, and that could lead to cracks.

Nice to hear someone ordered BTLOS 60, I was on the fence between them and LB 56, but have ordered LB a couple days ago (laced to Bitex, rim brake). Please report back on your BTLOS, maybe create another thread dedicated for this brand and post the link on this one too.