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"I don't live in the past. I'm always excited by what I'm doing in the present." Sir Clive Sinclair


Author Topic: Is this Normal  (Read 8239 times)

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Offline Luke S

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Re: Is this Normal
« Reply #15 on: 17, January, 2013 - 06:54:49 »
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I have to say my front brake is rubbish!

same ::) :P

Offline KarlG

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Re: Is this Normal
« Reply #16 on: 17, January, 2013 - 08:30:53 »
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I have to say my front brake is rubbish!

same ::) :P

Then why do they work well with metal wheels? 

Offline Luke S

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Re: Is this Normal
« Reply #17 on: 17, January, 2013 - 16:04:29 »
Quote
I have to say my front brake is rubbish!

same ::) :P

Then why do they work well with metal wheels?

What???????
« Last Edit: 17, January, 2013 - 17:04:45 by Luke Salsbury »

Offline KarlG

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Re: Is this Normal
« Reply #18 on: 17, January, 2013 - 16:55:29 »
What do you mean by 'What'. Sorry but I'm no mind reader.

Offline Luke S

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Re: Is this Normal
« Reply #19 on: 17, January, 2013 - 17:05:48 »
I don't get what you mean by this  ??? ??? ???
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why do they work well with metal wheels?

Offline KarlG

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Re: Is this Normal
« Reply #20 on: 17, January, 2013 - 19:39:32 »
Quote
I have to say my front brake is rubbish!

same ::) :P
Quite simple, this type of brake was the only brake type in production for many years (over 40) and they are not rubbish, they are still used on top class racing bikes even today.

They work well with metal wheels because the metal can withstand the heat produced when braking, plus metal has a better heat conduction that plastic, therefore the heat produced is dissipated over the complete rim and not just on the braking surface like the plastic wheels.

Metal wheels do not suffer as much as plastic when it comes to brake wear, when braking on long hills the heat produced by braking starts to melt the plastic surface of C5 wheels, firstly the outer surface of the plastic rim starts to granulate wearing the surface off even quicker, then the plastic starts to soften as the heat increases, and if the brakes are applied for an extended period on a worn rim the inner tube blows out of the rim. This blow out can and does also happen with metal rims, mainly with ali wheels, when the rim has been subjected to very heavy use e.g. MTBs that are often used for downhill racing. But, a metal wheel will hold out 100 times longer than a C5 plastic one.

Some of the new plastics that have been produced since 1985 are harder, stronger, and can withstand much more heat than that that was used for the C5 wheels.

If you say the C5 front brake is no good then I disagree with you, but if you say the braking system, which consists of callipers, blocks, cables wheels etc. is no good then I agree with you. OK olé?

Offline Luke S

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Re: Is this Normal
« Reply #21 on: 17, January, 2013 - 19:56:36 »
OK, thanks

Offline pso-buzz

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Re: Is this Normal
« Reply #22 on: 17, January, 2013 - 20:11:26 »
I am just confused I think. I used to think that we are just like a collection of chemicals that have turned into these things and evolved and we are born live and then die.  That we make all these ideas of god and spirits and afterlife theories to make us feel like we have a reason and to distract us from the fact that life is pointless a ware of time and has no meaning whatsoever.  We are bound by emotion and feelings but that these are just there to stop us killing each other and have enabled the human race to carry on for so long.


Not sure I understand this.

Offline Lancealot

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Re: Is this Normal
« Reply #23 on: 17, January, 2013 - 21:56:23 »
I have seen this problem a few times due to using the brakes incorrectly, incorrectly fitted and also bad brakes.

Like others I have tried to remove the grey of the rim but have given up and bought a new wheel £5 - not worth the effort.

Lance

Offline KarlG

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Re: Is this Normal
« Reply #24 on: 17, January, 2013 - 22:35:37 »
I'm not too sure but I think the grey is probably discolouring of the plastic caused by heat.  I have slight grey on #1 but none on #2.

Offline pso-buzz

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Re: Is this Normal
« Reply #25 on: 17, January, 2013 - 22:45:28 »
I have seen this problem a few times due to using the brakes incorrectly, incorrectly fitted and also bad brakes.

Like others I have tried to remove the grey of the rim but have given up and bought a new wheel £5 - not worth the effort.

Lance

Hi Lance

Did you go the metal wheel route or buy a plastic one?

Thanks

Simon

Offline Lancealot

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Re: Is this Normal
« Reply #26 on: 18, January, 2013 - 20:07:36 »
Hi Simon stayed with the original sinclair plastic wheels.

Lance