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Rec.Bicycles Frequently Asked Questions Posting Part 3/5
Section - 8c.2 Anodized vs. Non-anodized Rims

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Top Document: Rec.Bicycles Frequently Asked Questions Posting Part 3/5
Previous Document: 8c.1 Stress Relieving Spokes
Next Document: 8c.3 Reusing Spokes
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Date:    Mon, 20 Apr 1998 15:31:32 PDT

Dark anodized rims were introduced a few years ago as a fashionable
alternative to shiny metal finish, possibly as a response to non
metallic composites.  Some of these rims were touted as HARD anodized
implying greater strength.  Hard anodizing of aluminum, in contrast to
cosmetic anodizing, produces a porous ceramic oxide that forms in the
surface of the metal, as much as 1/1000 inch thick, about half below
the original surface and half above.  It is not thick enough to affect
the strength of the rim but because it is so rigid, acts like a thin
coat of paint on a rubber band.  The paint will crack as the rubber
stretches before any load is carried by the rubber.  Similarly,
anodizing cracks before the aluminum carries any significant load.

Rims are made from long straight extrusions that are rolled into
helical hoops from which they are cut to length.  Rims are often
drilled and anodized before being rolled into a hoop and therefore,
the anodizing is already crazed when the rim is made.  Micro-cracks in
thick (hard) anodizing can propagate into the metal as a wheel is
loaded with every revolution to cause whole sections of the rim to
break out at its spoke sockets.  In some rims, whole sidewalls have
separated through the hollow chamber so that the spokes remained
attached to the inner hoop and the tire on the outer one.  In
contrast, colored anodizing is generally too thin to initiate cracks.

As an example, Mavic MA-2 rims have rarely cracked except on tandems,
while the identical MA-40 rims, with a relativley thin anodizing, have
cracked often.

Anodizing is also a thermal and electrical insulator.  Because heat is
generated in the brake pads and not the rim, braking energy must flow
into the rim to be dissipated to the atmosphere.  Anodizing, although
relatively thin, impedes this heat transfer and reduces braking
efficiency by raising the surface temperature of the brakes.  When
braking in wet conditions, road grit wears off anodizing on the
sidewall, an effect that improves braking.

Anodizing is not heat treatment and has no effect on the structural
properties of the aluminum.

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Marr viewers back 'outstanding' Nigel Farage over fiery BBC interview

Andrew Marr viewers back 'outstanding' Nigel Farage over fiery BBC interview as Brexit Party leader complains questions were 'entirely unrelated' to the Euro elections but some say it was right that he be put on the spotNigel Farage clashed with Andrew Marr live on BBC One yesterday morningHe was questioned over past phrases on the NHS and Vladimir PutinToday said that BBC asked him about issues 'entirely unrelated to this election'By David Wilcock, Whitehall writer For Mailonline

published: 17:29 BST, 13 May 2019 kept up to date: 18:03 BST, 13 nicely 2019

Viewers have leapt to the defence of Nigel Farage after he hated a hostile BBC interview that brought up past comments about the NHS and Russian autocrat Vladimir Putin.

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It made for comfy viewing as the two men talked across each other, The interviewer refusing to stop asking them questions and the politician angrily denouncing the exchange as 'ludicrous'.

Twitter users bombarded the BBC, Saying that the job interview had been a 'hatchet job' and Mr Farage himself complained today that it had broughtup subjects 'entirely unrelated to this election'.

Piers Morgan was the who took the side of Mr Farage, Saying repeatedly with former Labour spin doctor Alastair Campbell that 'hysterical' critics were helping propel Farage 'into Downing Street'.

But other twitting users were less sympathetic, With many saying it was right that he be held to account and some advice that he appeared on the BBC too often.

Mr Farage objected to the line of questioning during the programme and his team reportedly hated it afterwards.

Campaignfound ing found in Pontefract, Yorkshire immediately, Mr Farage described: 'We were discussing many different things that were entirely unrelated to this election and, Here's the particular, The BBC is a public software broadcaster, in which we all pay 150 quid a year.

'Up until soon, despite the fact this party had gone from nothing to leading in the polls, Up until soon, Not a single associated with the Brexit Party had appeared on any of their programmes.

'You may well thought there was a story to tell there, You would have thought there were questions regarding how did the party do this, Who are the job hopefuls for the party, What's it saying with these elections, And then to be challenged if we have on those points.

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Nigel Farage says its his 'duty to face as MP at the next. Theresa May is ready to let MPs decide on how to break.

'We had little or no of that. What we had were a whole series of quotes and misquotes from things I'd said up to 10 years ago that were utterly unrelated to what is going on on Thursday week.

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Next Document: 8c.3 Reusing Spokes

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