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Deep section rims, 38mm or 50mm?
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02-12-2012 7:22pm#1
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Join Date:Posts: 73399
The "aero advantage" is only going to be of material benefit if you are riding off the front of the group (or chasing to get back on
), and either going solo or in pursuit mode in a small group 0 -
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That seems to be the only argument for going for one over the other
It's the only argument, EVAR!
Like you said, you're a big guy at 85 Kg, so:
1) Less affected by crosswinds when riding deeper sections
2) The relative weight difference in the wheels, even taking into account the rotational weight, isn't going to make any difference.
That BMC deserves 50s.0 -
That seems to be the only argument for going for one over the other
It's more a question of whether you want to go down the aero rabbithole or not.
For TTing, 50mm is too shallow (IMO). You want a HED trispoke or Zipp 808 up front and disc on the rear. Weight isn't an issue, and you can't use either of those in a road race.
For road racing, you have big compromises to be struck between weight, durability, cost, aerodynamics and practicality. Do you need the wheel to be true-able without taking the tub off? Is so, avoid internal nipples. Do you want the best aerodynamics? If so, avoid v-section rims and get some Zipps. Can you cope (financially, emotionally) with the cost of replacing a wheel if you crash or hit a big pothole? If so, avoid Zipps. Do you want to use the wheels for hillclimbs? If so, watch the weight.
That's why you should just buy something cheap, deep and attractive.0 -
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I got a set of CSN SUPPERLEGGRA 50mm deep sections in ribble and they have been raced for two years with no problems.They are available in red or white shimano or campag,clincher or tubs all the same price.About 465 sterling.They also look well and have an aluminium braking surface.
They're pretty heavy thoughDirkVoodoo wrote: »It's the only argument, EVAR!
Like you said, you're a big guy at 85 Kg, so:
1) Less affected by crosswinds when riding deeper sections
2) The relative weight difference in the wheels, even taking into account the rotational weight, isn't going to make any difference.
That BMC deserves 50s.
It would look good on 50's alright
It's more a question of whether you want to go down the aero rabbithole or not.
For TTing, 50mm is too shallow (IMO). You want a HED trispoke or Zipp 808 up front and disc on the rear. Weight isn't an issue, and you can't use either of those in a road race.
For road racing, you have big compromises to be struck between weight, durability, cost, aerodynamics and practicality. Do you need the wheel to be true-able without taking the tub off? Is so, avoid internal nipples. Do you want the best aerodynamics? If so, avoid v-section rims and get some Zipps. Can you cope (financially, emotionally) with the cost of replacing a wheel if you crash or hit a big pothole? If so, avoid Zipps. Do you want to use the wheels for hillclimbs? If so, watch the weight.
That's why you should just buy something cheap, deep and attractive.
Don't want to go down the aero rabbithole as such, I don't see the overall benefits of them for road racing, just that they seem to be quite light, given the price, with the PX and Fuerte Bici 50's weighing in at ~1450g each...the latter have external nipples, which is another reason I'm more interested in these over the PX's....
I understand weight and aerodynamics aren't the be all and end all. I've been 50/50 between the above 50mm off the shelf wheels, or a set of handbuilts from wheelsmith.co.uk, or preferably Holyboy on here, using DA hubs, sapim spokes and shallow alloy rims of some description. I was then 51/49 set on getting the deep sections, but now I'm back to being stuck between them.... The handbuilts would probably end up closer to 1700g, but easily repaired and probably a hell of a lot stiffer? But would they be noticeably snappier/livlier than the ~1700g aksiums currently on the bike?
Zipp's are out of my price range, €600 would be my absolute max.
The only hills I'll be climbing on them will be the hills that occur during road races.
Whatever wheels I end up with will be purely for racing, and I'll be training on the aksiums.Am I the only cyclist that thinks deep section wheels look hideously ugly?
Yes! 0 -
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What spokes and hubs did you build them with? How much did the build cost you? And can you comment on their stiffness?
Decided I wanted a light-ish set of wheels and fancied trying tubs, and didn't want to go over €500.
Spokes were 258mm Sapim CX Ray on the front and 262mm and 264 mm DT Swiss Aerolite for the back. (Just because I couldn't get the right length DT Swiss for the front)
Hubs were just the P-X Pro hubs,
And the R50 rims
All wheel hardware from P-X came in at around € 470
Got my tubs, valve extenders, glue and a box of DT Swiss pro lock nipples on www.bike-discount.de, for about a further € 170
Then of course I had to buy a truing stand to assemble the wheels, as this was my first time building from scratch :eek:
So I may very well have been better off just buying off the shelf, but where's the fun in that !!! And now I'm tooled up for a lifetime of wheel servicing in the shed
(BTW radial front wheel was simples to build, rear wheel 2 x cross, was not so simples, but I knew I had the back up of a bike shop mechanic team mate to bail me out )
I only raced them a couple of times at the end of the season, so can't say anything about the durability of the hubs. As for stiffness I no expert and can't say I've riden a massive range of wheelsets to compare them to, but didn't have any problems, I'm also in the 80-85 kg range.
My only previous carbon wheels are a set of first generation of Planet X 50 mm clinchers I've had for 5 years and have given dogs abuse. They have never given me any hassle, and I've done RAAM, RAI and countless league and open races on them, the hubs still run freely and I've only had to get them trued a couple of times after crashes and very severe pothole impacts.
I know some folks may not like what the P-X brand have to offer, but as a budget concious racer they're hard to beat on value!!0 -
That seems to be the only argument for going for one over the other
What more do you need? The deeper the better they look IMO. A mate of mine has stupidly deep 80mm deep wheels, amazing looking. They make my 55mm cosmics look pathetic.
The noise they make when sprinting is great as well.
The only negative I've found with the deeper rims is a slightly odd feeling when cornering on a descent. I'm 100kg though so I laugh at crosswinds. they/them/theirs
And so on, and so on …. - Slavoj Žižek
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