Performance difference between 25, 35, and 45mm deep rims?
Moderator: robbosmans
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You haven't read the Hambini topic?
The chart starts with a Mavic Ksyrium which would be equivalent to your 25mm rim and includes various 35mm and 45mm wheels that you can compare it to. You don't have to read anything. Just look at the wheel charts:
I saw that chart, all the wheels look to be deeper section than I'm looking for.
Currently debating the NOX Falkor 36 and the FSE 35mm
Still reading through the Hambini thread. Lots of stuff flying right over me though. I'm not very smart
There are really only 3 takeaways from that thread.
1. Deeper = faster
2. Wider = faster
3. Unless they screw up the gap between the tyre and the rim (hence the hunt and flo results)
I would make your choice between those two rims based on the braking quality, hub, weight and price.
1. Deeper = faster
2. Wider = faster
3. Unless they screw up the gap between the tyre and the rim (hence the hunt and flo results)
I would make your choice between those two rims based on the braking quality, hub, weight and price.
Chasse patate
There are several 35mm rims on the chart which you can compare to the base Ksyrium rim. It's basically a 4 watt savings at 30km/hr, and 15 watts 50km/hr. If the goal is to save watts I'd go deeper.
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I would go for braking and wider rims (more stable).
If you want wheels rather easy to find cheap, Easton Aero 55 tubular. The clincher version weight is alot more.
If you want wheels rather easy to find cheap, Easton Aero 55 tubular. The clincher version weight is alot more.
Bikes:
Ax Lightness Vial EVO Race (2019.01.03)
Open *UP* (2016.04.14)
Paduano Racing Fidia (kind of shelved)
Ex bike; Vial EVO D, Vial EVO Ultra, Scott Foil, Paduano ti bike.
Ax Lightness Vial EVO Race (2019.01.03)
Open *UP* (2016.04.14)
Paduano Racing Fidia (kind of shelved)
Ex bike; Vial EVO D, Vial EVO Ultra, Scott Foil, Paduano ti bike.
The difference is small head on, but you get a lot sail area when in cross winds. If the rims are the same relative shape, you'll get better steady state crosswind performance out of deeper wheelsets. Deeper wheelsets tend to stall aggressively as they are turned too far into the wind. The differences you can see in any aero test you believe in, but the shape and width are more important than the exact depth.
Basically 10% difference at 50kph from “a” road wheelset with a bit of a V to what you should expect out of a TT 80mm wheelset. You get a lot of that just by shaping the rim better and adding a touch of depth. You lose most of it with the wrong tire size
Basically 10% difference at 50kph from “a” road wheelset with a bit of a V to what you should expect out of a TT 80mm wheelset. You get a lot of that just by shaping the rim better and adding a touch of depth. You lose most of it with the wrong tire size
Last edited by jfranci3 on Fri Oct 19, 2018 11:27 pm, edited 1 time in total.
From the thread
Deeper is faster unless they screw up the profile but wider is not faster.
Wider is slower but the fixed tyre width (23mm) means you need to optimize for that size
Deeper is faster unless they screw up the profile but wider is not faster.
Wider is slower but the fixed tyre width (23mm) means you need to optimize for that size
Hambini Aeronautical Engineer, Polluting YouTube since 2016 - views expressed are my own...
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Wider wheel (than needed by the tire width) is slower.
Needed width for 23c tire is not much, easily achieveable by most modern carbon wheelset.
Story change when your road demand 25c, 28c and you want to keep it aero. Wheels from multiple years ago are generally too narrow. Wider (than wheel design for 23c) become faster to a point when it's already plenty wide.
See Shimano C60 against Enve 7.8, Enve is wider and perform better with 25c...
here: https://weightweenies.starbike.com/foru ... 5#p1432819
Needed width for 23c tire is not much, easily achieveable by most modern carbon wheelset.
Story change when your road demand 25c, 28c and you want to keep it aero. Wheels from multiple years ago are generally too narrow. Wider (than wheel design for 23c) become faster to a point when it's already plenty wide.
See Shimano C60 against Enve 7.8, Enve is wider and perform better with 25c...
here: https://weightweenies.starbike.com/foru ... 5#p1432819