Velocite filament wound rims

Everything about building wheels, glueing tubs, etc.
biohazard31
Posts: 8
Joined: Fri Feb 16, 2018 2:54 pm

by biohazard31

Sharing this screen grab picture from facebook. Too bad, no details given on this image so can't say anything about it. Anyone here had the same experience with the 35TCC / TCD?

Image

biohazard31
Posts: 8
Joined: Fri Feb 16, 2018 2:54 pm

by biohazard31

Image
This happened today. Tubeless tire inflated to 120psi left overnight then woke up with this. I haven't use the wheels. Only mounted on the bike. Not my luck maybe

by Weenie


tomycs
Posts: 52
Joined: Tue Mar 15, 2016 1:06 pm

by tomycs

I've done a few hundred miles on my pair of 507s. Mixed feelings.

Front wheel pulsing, mediocre braking and a very tight valve hole as the main drawbacks. Front wheel pulsing has gotten better with wear, to the point where it's no longer distracting, however braking has gotten poorer as well. The tight valve hole is annoying, as it only allows certain tubes (I don't run them tubeless), I guess the advantage there is long valves don't rattle.

Positives: Weight was less than advertised, mounting tyres is easy for such wide wheels (no issues with either pre or post 2016 Schwalbe Ones in 25mm), they're plenty stiff, they look good on my Propel, VFM looked ok.

Mixed bag all in all. I don't find them any faster than my 38mm Ushaped farsports. I don't find them any better in crosswinds than my 50mm high - 25mm wide Ushaped farsports tubulars either. Take the sidewinds bit with a grain of salt, I'm not a lightweight so I'm rarely bothered by sidewinds :-)

So in the end, I'm keeping them but I'm not sure I would recommend the rim brake version (the disc version could actually be the better choice with these wheels).

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ms6073
Posts: 2372
Joined: Fri Jul 23, 2004 8:24 pm
Location: Houston, Texas

by ms6073

biohazard31 wrote:
Fri Apr 20, 2018 2:24 pm
Tubeless tire inflated to 120 psi left overnight
Sorry to hear about the issue with the rim. Have to ask why you felt you needed to inflate to 120 psi? For road tubeless, 60-85 psi is generally sufficient to seat a tire, not to mention 80 psi is the max I use out on the road for our Nox Composites tubeless wheels.
Michael - The Anaerobic Threshold is neither...

biohazard31
Posts: 8
Joined: Fri Feb 16, 2018 2:54 pm

by biohazard31

I usually inflate my 23c tires to 120psi(both aluminum alloy and carbon wheels), my tubeless tire manufacturer's recommendation minimum pressure is 110psi.

1415chris
Posts: 1045
Joined: Sat Apr 18, 2009 8:59 am
Location: Surrey UK

by 1415chris


biohazard31 wrote:Image
This happened today. Tubeless tire inflated to 120psi left overnight then woke up with this. I haven't use the wheels. Only mounted on the bike. Not my luck maybe
Maybe it was your luck that this happened over night at home and not on the road with possible bad consequences.

biohazard31
Posts: 8
Joined: Fri Feb 16, 2018 2:54 pm

by biohazard31

1415chris wrote:
Fri Apr 20, 2018 7:09 pm
biohazard31 wrote:Image
This happened today. Tubeless tire inflated to 120psi left overnight then woke up with this. I haven't use the wheels. Only mounted on the bike. Not my luck maybe
Maybe it was your luck that this happened over night at home and not on the road with possible bad consequences.
Yes it's the other way around. Blessing in disguise

hannawald
Posts: 156
Joined: Sat Dec 17, 2016 7:28 pm

by hannawald

biohazard31 wrote:
Fri Apr 20, 2018 2:24 pm
Image
This happened today. Tubeless tire inflated to 120psi left overnight then woke up with this. I haven't use the wheels. Only mounted on the bike. Not my luck maybe
120 psi should be within recommended range 90-125 psi, for your 23mm tyres ok.. it was just standing, so it should survive much more to be prepared for ride, braking...

Do you have a message from Victor, the owner? I don't know how many wheels are sold, but this is 2nd picture of faulty wheel within short period:(

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vmajor
Shop Owner / Manufacturer
Posts: 419
Joined: Wed Oct 15, 2008 4:09 am
Location: Beringen, Belgium
Contact:

by vmajor

Thanks @hannawald for alerting me to these posts. I managed to get unsubscribed from this thread, again.

Both of these rims look like our earlier generation rims. But we cannot know without serial numbers. Did you contact us regarding a warranty yet? I saw the failure that Biohazard had before. It happened with our first generation rims and is a known failure mode, so there will be no argument regarding the replacement.

The failure itself looks scary and is terminal (to the rim) but the rim integrity is not as compromised as it looks. The wheel itself is likely still pretty much true. This is due to the particular type of internal construction of the rim. There is no single point of failure.

The TCD rim (the Facebook source) looks familiar. We had one such case in France. This was the only case and it was remarkably unusual. That wheel failed while the bike was being transported in a car. We never saw anything like this before or since. It happened about 1 year ago.

tl;dr please contact us regarding the warranty

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vmajor
Shop Owner / Manufacturer
Posts: 419
Joined: Wed Oct 15, 2008 4:09 am
Location: Beringen, Belgium
Contact:

by vmajor

On more uplifting news, the long awaited deeper profile rim is nearing reality. It is now called a Venn 77. It is made using a different filament winding process so it is not going to be a Rev hence no full name yet.

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Vital statistics:
Profile: 77mm
Maximum width: 30mm
Internal width: 21mm
Projected weight: 620g

Image

The rim profile was developed by an artificial intelligence type of goal seeking optimizer. The goal that it was given was to deliver the lowest aerodynamic drag within a particular set of predetermined geometric constraints.

In total 675 different profiles were generated by the optimizer, and tested, before the final result was identified. I will write more about the development process in a blog post later.

I hope to have some sample rims within 60 days, with production shortly afterwards.

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