Open mold wide profile carbon wheels

[Hexsense]

I'm 70kg and run the 25mm 4000S II on 21C with 58psi front and 65psi rear. Question is, if I would notice any difference with 23C as the side walls already stand "straight". Could I go another 5psi lower or not...? 30mm on the outside would mean better aerodynamics than the 28mm I have now, but again, the difference will be in the lower one digit watt area at 45km/h - would anyone notice?

probably not. 23mm and 21mm's difference shouldn't be anywhere as noticeable as moving from 17mm to 21mm (or 13mm to 15mm then to 17mm).
It's just another 'a bit wider, and deeper' option available. It's for people running narrow rim to upgrade to. Not really for us who already have 21mm inner width rims.

It'll be my choice when i move to disc brake for sure, though.

[matty]

Just came across another supplier

http://www.eiecarbon.com/carbon-rim-road-bike/

I wonder how many make their own?

[Cannonwhale]

Far sports have a new range of rims for sale, with substantially lower rim weights than previous generations offered.

[Hexsense]

OUTER width is only 23mm and 25mm?
that's exactly what i wouldn't buy.

[Hexsense]

Venn is finishing their 21mm internal width, 30mm external width and 77mm deep.
viewtopic.php?f=113&t=131368&start=285

So now we have pretty much a complete range of depths of (inexpensive carbon) internally and externally wide wheels .
36mm deep, 28mm external, 21mm internal Lightbicycle,
46mm deep, 28mm external, 21mm internal Lightbicycle,
50mm deep, 28mm external, 21mm internal Venn,
56mm deep, 30mm external, 23mm internal Lightbicycle, <-coming soon
77mm deep, 30mm external, 21mm internal Venn <-coming soon

[AZR3]

That lightbike 56mm is pretty much spot on with what I’m looking for! Good thing I don’t need wheels now cause I’d be checking their site everyday lol

[hannawald]

And do we know something about the new 56/23mm LB rims? Weight? I would be suprised if they will be less than 500g...

[kyleFu]

A supplement for wide profile wheels, Farsports is available of outer 28mm width * internal 20mm width, both with brake and Disc brake.

U shape 38*28 clincher rim, 480g/pc+/-10g
U shape 45*28 clincher rim, 500g/pc+/-10g
U shape 58*28 clincher rim, 560g/pc+/-10g

38*28 disc brake is a good option for climbing, can be 1565g/set+/-30g for wheelset with DT240 (24/24H) + cx-ray, hub is optional for upgrade to 36ratchets and 54ratchets.

[hannawald]

really not being rude, i just wonder...why would you put DT240/CX Ray on wheels with such a heavy rims? Isn´t it a rim for novatec hubs and some chinese spokes? or the rim doesn´t matter that much? I don´t speek in general about chinese rims, Light Bicycle rims seems to me different league..

[pushstart]

Yeah, those Farsports rims are heavy compared to LB or Yishun's new asymmetric rims, and (assuming those profile pics above are for these same rims) also don't look very tubeless-friendly.

So far, I agree that LB is in a different class. My new Yishun rooms built up fine, but the spoke drillings seemed not to be angled/offset, which made some of the spoke entry angles a little greater than I should have liked. I suspect it will be just fine. Certainly no problems in first 200mi.

[Marin]

Anyone have experience with EIE carbon? Rims are very light, claimed 460g for 60x25mm =0

[Beaver]

Venn is finishing their 21mm internal width, 30mm external width and 77mm deep.
viewtopic.php?f=113&t=131368&start=285

So now we have pretty much a complete range of depths of (inexpensive carbon) internally and externally wide wheels .
36mm deep, 28mm external, 21mm internal Lightbicycle,
46mm deep, 28mm external, 21mm internal Lightbicycle,
50mm deep, 28mm external, 21mm internal Venn,
56mm deep, 30mm external, 23mm internal Lightbicycle, <-coming soon
77mm deep, 30mm external, 21mm internal Venn <-coming soon

The 30mm wide rims will be the first after Enve's 4.5 AR to match 25mm tires. All the others are designed around 23mm tires - and yes, the differences will be hard to notice.

[kuniyokeiji]

i think the 28 externals are made for 25mms
and 30 externals are made for 28mms

[hambini]

I'm 70kg and run the 25mm 4000S II on 21C with 58psi front and 65psi rear. Question is, if I would notice any difference with 23C as the side walls already stand "straight". Could I go another 5psi lower or not...? 30mm on the outside would mean better aerodynamics than the 28mm I have now, but again, the difference will be in the lower one digit watt area at 45km/h - would anyone notice?

probably not. 23mm and 21mm's difference shouldn't be anywhere as noticeable as moving from 17mm to 21mm (or 13mm to 15mm then to 17mm).
It's just another 'a bit wider, and deeper' option available. It's for people running narrow rim to upgrade to. Not really for us who already have 21mm inner width rims.

It'll be my choice when i move to disc brake for sure, though.

I doubt you would notice an aerodynamic difference. There is only deflection at the bottom of the wheel/tyre combination and that area has favourable velocity.

What I am trying to say is the tyre holds it's profile for 95% of the circumference it's only where it comes into contact with the road that it's squished.

Hope that helps

Hambini

[Hexsense]

i think the 28 externals are made for 25mms
and 30 externals are made for 28mms

mm is the key. tires on wide rim are normally wider than their specified c mark.
23c on my 21mm internal width is >27mm
25c on my 21mm internal width is >28mm
28c on my 21mm internal width is >30mm

so, 30mm external is ideal for 25c which is ~28mm. You know that Specialized Roval CLX50 which is >30mm wide tested to be best aero when pair with 24c Specialized Turbo tire (which run narrower than Continental) right?
However, due to the widest point of the rim being brake track rather than somewhere down in the middle of the rim (more like new generation Enve, Bontrager Aeorus and Venn 507 rather than classic U-shape Zipp). I guess 28c is still on a great performer side.

I doubt you would notice an aerodynamic difference. There is only deflection at the bottom of the wheel/tyre combination and that area has favourable velocity.

What I am trying to say is the tyre holds it's profile for 95% of the circumference it's only where it comes into contact with the road that it's squished.

Hope that helps

Hambini

Thank you for the insight. I agree that we wouldn't notice the difference between 21mm and 23mm internal width at all. Aerodynamic are more of the function of external width more than internal width. For the control side, 21mm is already at the point where 23-30c tires are already stable in hard cornering at low pressure. it's not like 28c tire on 15mm rim where tire is easily got pushed side way making squishy feeling.