Mr.Gib wrote: ↑Sun Apr 18, 2021 12:37 am
doc88 wrote: ↑Fri Apr 16, 2021 10:21 pm
hello I'm Gianluca from Italy! I have some questions to the owners of lightbicycle wheels,
but first some personal specs: I'm 80kg, I ride a racing bike with rim brakes, only asphalt, I'm going to use tubeless 28mm tyres, looking for a medium aero rim 40-50mm:
1) most important: are these wheels good for rim brakes? has anyone had any issues?
2) v-shaped AR series vs u-shaped R series, which one is the best?
3) for 28mm tubeless which one is better: 23/30mm inner/outer width or 21/28mm inner/outer width?
Thanks to everyone is going to help!
Cheers
The braking should be as good as any other brand and better than many.
You do need to be careful with 23/30mm rims on a rim brake bike. 28mm tires will get close to the brake caliper or frame on some models. Of course some frames have good space and can do it. I can fit up to 32mm measured on my Factor rim brake with EE direct mount brakes. Which brake calipers will you use? Some are borderline with 30mm rims.
As for the 105 rule, it only matters if you are trying to optimize for every watt. I use 28mm Vittoria Corsas on 28mm wide rims on days that I want more comfort. I even use a 30mm tire on the rear sometimes as well. There are no issues in crosswinds, another reason you don't want the tire much wider than the rim.
@Mr.Gib thank you! I looked at my frame specs it should fit up to 32mm but I never tried before
what I didn't consider was my brake calipers specs!
I have SHIMANO 105 Direct Mount Front Brake Caliper on the front (BR-R7000-F) and SHIMANO 105 Dual-Pivot Brake Caliper on the rear (BR-R7000)
https://bike.shimano.com/en-US/product/ ... r7000.html
and checking thier specs I can fit max 28mm rims and 28c tyres
alanyu wrote: ↑Sun Apr 18, 2021 4:12 am
doc88 wrote: ↑Fri Apr 16, 2021 10:21 pm
hello I'm Gianluca from Italy! I have some questions to the owners of lightbicycle wheels,
but first some personal specs: I'm 80kg, I ride a racing bike with rim brakes, only asphalt, I'm going to use tubeless 28mm tyres, looking for a medium aero rim 40-50mm:
1) most important: are these wheels good for rim brakes? has anyone had any issues?
2) v-shaped AR series vs u-shaped R series, which one is the best?
3) for 28mm tubeless which one is better: 23/30mm inner/outer width or 21/28mm inner/outer width?
Thanks to everyone is going to help!
Cheers
1) Brake power is good in dry, above average in wet but low in heavy rain (most carbon rims are low in heavy rain). Farsports have a better brake track.
2) Considering the tire-rim combo and the specifiec shape of AR and R (rim brake), the wide curved-V-shape of AR has a more relaxed 105 rule than the U-shaped R. I have AR56-28/21 and other open module rims whose shape is the same as R (38 front and 50 rear). The U shape is more stable in small yaw while the wide curved-V shape is more stable in big yaw even with a deeper profile. The curved-V is pushed left and right like an oscillator in small yaw, kinda unstable. One needs to get used to this oscillator behaviour which only happens in small yaw and then will find the handling easier as the side force is actually smaller than the U shape.
U vs wide curved V.png
3) Make sure the clearance of
both your frame and brake is enough. My frame and brake (EE G3 DM) have clearance for 32 mm (real width) tires, but EE works better with the rims whose
brake track width is no larger than 28 mm.
For 28c tubeless, some would measure 28 mm on a 21c rim but most are wider while most others would be more than that. For both aero and comfort, 23/30 is better if you stick to 28c tubeless.
@alanyu thanks a lot!
as far as my brakes caliper specs is concerned the answer is the same I gave to @Mr.Gib...my max rim and tyres width are respectively 28mm and 28c
please correct me if I'm wrong but after what you taught me, for better aero performances, I must use 21/28mm rim width with 25c tubeless tyres which hopefully will be a little wider than 25mm for both aero and comfort reasons
very interesting the graph you shared! basically lateral force produced by yaw is always lower with wide-curved V shaped rims than U-shaped rims and with wide-curved V shaped rims unstableness decreases with increase of yaw. in other words the only scenario where U-shaped rims are better than wide-curved V shaped rims is when there is small yaw where, even if lateral force is bigger than the lateral force You would have with wide-curved V shaped rims, they results more stable.
really thank you to both @Mr.Gib and @alanyou to open my eyes about not only frame but also calipers clearance!
I was considering Light Bicycle because it was the only company offering a 23/30mm rim, but now I have understood I'm stuck with 21/28mm is there any other company I should reconsider in your opinions? is there something better out there or you would always buy from Light Bicycles?
thanks thanks thanks
.
Could buy another bike with the difference from my AR56s! 
