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Wider aero rim for 6 speed?

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Wider aero rim for 6 speed?

Old 11-09-18, 08:23 PM
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loubikes
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Wider aero rim for 6 speed?

I have a mid 80's Bianchi road bike that I want to put wider, aero rims on. My priority is wider rims, I'd like to get 30 or 32's on there. My rims measure 13mm, I'd like to get 17mm. If possible, I'd like the rims to be aero. The hub has to accommodate a freewheel.

What would my options be? Would this be hard to find? Where should I go about looking?

Thanks!

I have checked and it seems the frame can accommodate 32's. I put 32's on the rims and it fit with a small amount of extra space but with wider rims I expect the tube to balloon less, giving even more space (very possible I'm wrong about this). I've been using Sheldon Brown's tyre sizing article as a guide.
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Old 11-09-18, 08:53 PM
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Do you have a picture of your current 13mm rims? 32s and 35s have had no trouble staying on my Mavic Open Pros and Velocity Aeroheads which I think are 19mm.
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Old 11-10-18, 12:47 AM
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Originally Posted by loubikes View Post
I have a mid 80's Bianchi road bike that I want to put wider, aero rims on. My priority is wider rims, I'd like to get 30 or 32's on there. My rims measure 13mm, I'd like to get 17mm. If possible, I'd like the rims to be aero. The hub has to accommodate a freewheel.

What would my options be? Would this be hard to find? Where should I go about looking?

Thanks!

I have checked and it seems the frame can accommodate 32's. I put 32's on the rims and it fit with a small amount of extra space but with wider rims I expect the tube to balloon less, giving even more space (very possible I'm wrong about this). I've been using Sheldon Brown's tyre sizing article as a guide.
On wider rims, the tire will be wider with the same circumference. My Compass 32mm Stampede Pass on 23mm outside width tb14’s measures 32.5mm wide, same tire on a 19mm Mavic Open4CD was 29.5mm wide. How about the 28mm Chinook Pass on a wider rim, which are 29mm actual width on those tb14’s? Ride differences are minor.

BTW, don’t expect to see any performance difference due to “aero rims’ unless you spend a lot of time at 20mph or more, but wider is nice to gain tire volume.

Rims can be built on just about any hubs with corresponding spoke counts; freewheel or cassette doesn’t matter.

Last edited by Dfrost; 11-10-18 at 12:53 AM.
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Old 11-10-18, 01:21 AM
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Originally Posted by loubikes View Post
I have a mid 80's Bianchi road bike that I want to put wider, aero rims on. My priority is wider rims, I'd like to get 30 or 32's on there. My rims measure 13mm, I'd like to get 17mm. If possible, I'd like the rims to be aero.
I'm not sure why you'd only go to 17mm for an aero rim when you plan on using 30mm tires; aero rims perform best when they're as wide as the tire is, so they can more easily recapture airflow from the tire. This is a big part of why aero rims have been getting so fat. And many current-gen aero rims - even for only 25mm tires - are now around 21mm internal. The ENVE 4.5 AR, designed for tires in the size you're looking at (but disc-only), is 25mm internal and over 30mm external. You'll still probably get some aero benefit with a narrower aero rim, but likely less.

17mm-internal rims will work just fine with your tires, in terms of tire function, though.

The hub has to accommodate a freewheel.
Pre-built deep aero wheels that accommodate freewheels are basically nonexistent. If your Bianchi is steel, you could probably re-space your frame the 4mm to fit a modern freehub wheel without issue.

If you're building the wheel... 36H aero rims are incredibly uncommon, but 32H are available. You can buy 32H aero rims from FLO, for instance.

with wider rims I expect the tube to balloon less, giving even more space (very possible I'm wrong about this).
No, wide rims tend to fatten tires.
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Old 11-10-18, 11:55 AM
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Originally Posted by loubikes View Post
I have a mid 80's Bianchi road bike that I want to put wider, aero rims on. My priority is wider rims, I'd like to get 30 or 32's on there. My rims measure 13mm, I'd like to get 17mm. If possible, I'd like the rims to be aero. The hub has to accommodate a freewheel.

What would my options be? Would this be hard to find? Where should I go about looking?

Thanks!

I have checked and it seems the frame can accommodate 32's. I put 32's on the rims and it fit with a small amount of extra space but with wider rims I expect the tube to balloon less, giving even more space (very possible I'm wrong about this). I've been using Sheldon Brown's tyre sizing article as a guide.
So you’re keeping your existing hubs and plan to have them laced into some wider aero rims?

Could you provide more info about your current hubs? Which rear spacing do you have on your bike 120, 126? Are you looking to do this wheel re-build on any particular budget? Are you wanting mild aero benefits or you talking all out 50+ mm rim profile? Aluminum or carbon rims.

I’ve been thinking for a while now that classic and vintage bikes would be a fertile breeding ground for tastefully done wheel rebuilds using modern (wider) rims that can take advantage of some of the better tire technologies available now.

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Old 11-10-18, 01:15 PM
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You will probably have to have your hubs rebuilt with new rims. Not much in prefabricated 'wheelsets' available in the old 126mm standard.

Consider the Velocity A23 or H+ Son Archetype rims. They are both about 23mm wide, maybe 18mm inside I guess. They both come in 36H if that's required. Kind of overkill for aero rims, but it would be strong. I'm running the A23 rims right now with Conti GP 4000SII tires that are nominally 28, but on the A23 rims they are about 30.7mm wide.
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Old 11-10-18, 01:21 PM
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A wide aero rim was an oxymoron in the 1980s. Most were 13-16mm across the inside of the rim flanges. However, there are modern alternatives, assuming you need 700C and not 27". For instance, Velocity has the Aileron (20mm width) and Quill (21mm width).

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Old 11-10-18, 04:27 PM
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The period correct aero rim would be Araya ADX-2W. Roughly a 16-22 rim. Have not seen one for a long time. They were a bit on heavy side too. My choice for your build would be H+Son.
If you have doubts about fitting the big tire join the club. Not always possible to tell until you try. And then the tire stretches.

Last edited by 63rickert; 11-11-18 at 07:06 AM.
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Old 11-10-18, 08:12 PM
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I had so Pacenti SL23 rims laced to some 6 speed Dura Ace hubs and wound up with a modern style wide rim wheelset weighing in under 1600 grams easily. Made the bike feel even better out on the road.

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Old 11-11-18, 03:19 PM
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I've been eyeing the Pacenti Forza (wow, only $85 now: https://pacenticycledesign.com/colle...ad-front-rim-1) or Velocity Quill next time I need to build a rear 700C wheel. It's amazing what they've done with aluminum rims since the 1980s.
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Old 11-13-18, 07:18 PM
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Originally Posted by Dfrost View Post

On wider rims, the tire will be wider with the same circumference.
Ok, good to know. I was assuming that a wider rim would mean the tire flattened-out and didn't sit as high (shorter circumference?), which would give me more clearance from the top of the tire to the frame.
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Old 11-13-18, 07:21 PM
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Originally Posted by masi61 View Post


So you’re keeping your existing hubs and plan to have them laced into some wider aero rims?

No. Sorry, I should've been more clear. I was to find an existing, used wheelset. I'm looking to spend as little as possible ($100-200) and don't have the skill-sets to lace a rim to a hub.
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Old 11-13-18, 07:24 PM
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Originally Posted by Salamandrine View Post
You will probably have to have your hubs rebuilt with new rims. Not much in prefabricated 'wheelsets' available in the old 126mm standard.
Thanks, this pretty much answers my question. I guess I should have asked, "Can i find an aero wheelset with a hub that accepts a freewheel and has an internal rim-width of 17+mm." Thanks all!
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