Cycling UK Forum

thatsnotmyname

^^ As above - a company like Venhill could probably help if you're stuck.

thatsnotmyname

Marcus Aurelius wrote:I do know of 2 of them, they are not a household unit.

Be honest Nick, you have absolutely no idea who these people are.

thatsnotmyname

Straddle wires will be agnostic to whatever lever is being used, so if the length is right, use any you can find which are suitable..

thatsnotmyname

alexnharvey wrote:I believe there is no evidence you would accept because it would mean also accepting you were wrong.

I've demonstrated that they are plated to satisfy my own curiosity and I think sufficiently to demonstrate it for any reasonable and curious person.

Like I said earlier, science doesn't care what you believe - or in this case, what you 'think'. Whether you 'think' it is stainless or not is irrelevant. Nothing you have presented here so far proves they are not stainless.

alexnharvey wrote:I think you're not a reasonable person.

Ironically, I appear to be considerably more reasonable than you, on the basis that I am challenging your presumptions, which you seem to be making with little or no evidence. Like I said earlier, nothing you have said or shown on here proves anything. I'm trying to be guided by the science and the science suggests that it can currently all be explained within the characteristics of stainless. It doesn't necessarily prove they are stainless, but it certainly doesn't prove they are galvanised either. I'll leave you to reconcile that logic for a while....

thatsnotmyname

alexnharvey wrote:
thatsnotmyname wrote:As expected, the pics prove nothing unfortunately..

It seems quite fortunate for you to believe that, funnily enough.

Nothing you have said or shown on here proves that the spokes are not stainless. I'm simply responding with perfectly valid explanations of why they could be behaving in the way they are. So far, everything you have presented here is explainable and nothing you've said or done so far proves they are not stainless. You and Brucey won't want to hear that, but it remains true whether you like it or not.

As the old saying goes, "science doesn't care what you believe"

thatsnotmyname

thelawnet wrote:
thatsnotmyname wrote:
Marcus Aurelius wrote:Yes.

Obviously you have evidence for this, which you can link to..??

I already linked to it

https://facebook.com/369041236456978/po ... 386223000/
Scroll down, read comments

That’s just people ranting about cyclists ignoring the road closure. Nothing about covert subversive fifth column anti-cyclists on strava..

thatsnotmyname

As expected, the pics prove nothing unfortunately..

https://laforceinc.wordpress.com/2015/0 ... l-rusting/

What causes discoloration and oxidation of stainless steel?
All grades of stainless steels are iron-based alloys with significant percentages of chromium. Typically, stainless steels contain less than 30% chromium and more than 50% iron. Their stainless characteristics stem from the formation of an invisible, adherent, protective and self-healing chromium-rich oxide (Cr2O3) surface film. While stainless steels are resistant to rusting at room temperatures, they're prone to discoloration by oxidation at elevated temperatures due to the presence of chromium and other alloying elements such as titanium and molybdenum.

Factors that contribute to increased oxidation include high dew points, high oxygen and oxides of lead, boron and nitrides on the surface.

thatsnotmyname

Brucey wrote:You clearly have not read or understood what I have written, or something.

That discolouration is corrosion of the zinc plating.

I am (once again) bored stiff of this; another loopy rabbit hole beckons and I'm not going to be dragged into it.

You always say that as well..

thatsnotmyname

RickH wrote: Does it say no cycling as well as road closed?

Technically, if it's 'closed' then it's closed to all traffic. Which includes cycles. Unless otherwise stated. Having said that, if there's a footpath/sidewalk, then it's usually possible to wheel your bike along that. But unless the path is shared use, then riding along it would also be frowned upon.

thatsnotmyname

Marcus Aurelius wrote:
Mike Sales wrote:
Marcus Aurelius wrote:
Yup, ride whatever you need to, but shut up about it on Strava.

Are anti-cyclists using Strava to make propaganda against us?

Yes.

Obviously you have evidence for this, which you can link to..??

thatsnotmyname

Brucey wrote:Zinc is a coating, it just doesn't have to work as a barrier coating in order to be effective. Believe it or not the protection afforded by a sacrificial anode varies depending on the way in which ion transport can occur within the electrolyte. In a salt solution the sacrificial anode will work over a reasonable range. In an environment with no continuous electrolyte and/or a more aggressive corrosion condition, the same range of protection is not afforded. Hence I was careful to indicate the likely range of the sacrificial anode in this case.

If you remove all the zinc coating by grinding (rather than remove it locally or just scuff it up a bit using an abrasive) from a plated spoke and put it into salt solution it will go rusty pdq. If you don't believe me, try it, it is simple enough to do.

FWIW the plated spokes are corroding in the salt solution; Zinc oxide so formed is usually black in colour, and that is what we are seeing.

You're just repeating yourself now Brucey. In any case, I don't see any corrosion in those pics. Like I said earlier, discoloration is not corrosion. You would expect bare metal to show significant signs of rusting by now and it simply hasn't happened.

Meanwhile, I'll offer this quote from a write up on a study which looked at this very issue. I'll provide the link too, if you prefer. Just let me know.

The cathodic protection of zinc is limited by the width of the damaged area. The study conducted by Zhang and Xing showed that a critical distance exists signifying the maximum distance away from the zinc that it will protect the exposed steel (Figure 2, above). The maximum protection distance found (assuming a thin layer electrolyte and moderate zinc surface activity) was slightly greater than 1/4" (7 mm). However, once the width of the exposed steel increased beyond this distance, the protection distance decreases to a minimum of just over 1/8" (4 mm).

In other words, protection is not universally guaranteed regardless of damage. And once the exposed area goes beyond 7mm, you will start to see rust. Hope that clears things up.

thatsnotmyname

Marcus Aurelius wrote: and these pillocks sat around in the centre of a small town I’m living near.

Can't see anyone doing too much wrong there. And that's Eastleigh. Do you not normally live near there?

thatsnotmyname

Marcus Aurelius wrote:At the moment, any cyclists doing something utterly stupid, is going to stick out like a sore thumb.

Best not post any more pictures then..

thatsnotmyname

To be fair, if these people weren't cyclists, they'd probably all be having a massive barbecue with friends and family on Brighton beach. Idiots are still idiots - it's just that some of them ride bikes too.

thatsnotmyname

alexnharvey wrote:You are wrong about that because you do not understand how a sacrificial anode protects the part, despite it having been explained to you quite clearly.
It is not just a coating like Chrome plate or paint

See here also https://en.m.wikipedia.org/wiki/Galvanic_anode

I have tried to remove it all with the file but some will remain in the threads for example and bits I have missed with the file.

I know it's not a coating - there's no need to clarify that. As I said just now, 'sacrificial anode' or not, the web is full of pictures of galvanised steel where rust has taken hold in patches where the surface has been compromised. Some of that is probably down to the quality of galvanising in each individual case, while others are probably more indicative of "the theory not reflecting the reality." Galvanising is no guarantee of a defence against that and the cathodic protection offered to gaps, damage or deliberate removal of the galvanising is limited to a relatively small, local area - an important consideration that Brucey somehow omitted from his 'clear' explanation.

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