CRMC New Eligibility Rules

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Triplebrew2
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Re: CRMC New Eligibility Rules

Unread post by Triplebrew2 »

Eddy Wright wrote:The only chassis that looks and seems to work right with 10" wheels are fitted wth twin cylinder motors! such as the Nourish of nick's, or maybe a BSA twin etc. The rest just look well under tyred somehow!
So when i race my new 10" M R Euipe chassis next year ith my trident engine in it , it WONT work and ill be under tyred.
Well we'll have to wait and see. So any outfit with eithr 12" or 13" wheels should be beating me at every meeting then. Oh well, good job i just race for fun and arnt a pot chaser.
I dont care who races what, aslong as i can race and have fun. Roll on 2011!
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Eddy Wright
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Re: CRMC New Eligibility Rules

Unread post by Eddy Wright »

The point I was making was that if a Windle Imp or any other chassis for that matter was designed/ built to run a wider wheel with a bigger rim, then fitting a 10" wheel in the rear with a 5.5" tyre to comply with CRMC rules as they currently stand make the bike look under-tyred, and they do!

They other thing I find personally speaking being 6'2" tall is that I can fit more comfortably on a seat sat above a 13" wheel., and I would have thought any tall driver ordering a new chassis would take this in to account if he was thinking about a new IMP or some other large lump of an Engine.
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Re: CRMC New Eligibility Rules

Unread post by Triplebrew »

Now I am confused. Why would you want to put 10" wheels in a Windle Imp if it had either 12" or 13" to start with? It has been established that tyres for both these wheel sizes are available and even if more expensive than the 10" compliant Yokohama's must be cheaper than changing wheels? And what has wheel size to do with comfort? Surely that can be adjusted by bodywork, chassis mods etc. I am sure Nick Houghton is not that short and his Welsake is on 10" wheels and the same could be said for Colin Lewis?

I really enjoy the variety of outfits we have at CRMC meetings and the rules at present offer a pretty level playing field. I wonder why no one has measures tyre widths as Ian Johnson requested on the CRMC forum I redcall?
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Re: CRMC New Eligibility Rules

Unread post by Bob B »

May I just make an observation please gents? All of the early Imps ran 10" all round which certainly did not inhibit their perormance to the point that there was at least one that gave the Greenwood Mini a good run for its money on a good few occasions.

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Re: CRMC New Eligibility Rules

Unread post by Triplebrew »

Part of the reason I started this thread: viewtopic.php?f=13&t=34136
was in the hope that I would get lots of pics of bikes from the late 1960's and early 1970's to see fairing shapes, wheel sizes etc.
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Triplebrew2
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Re: CRMC New Eligibility Rules

Unread post by Triplebrew2 »

Your probably right Eddie, perhaps the sensable choice would be to get a 13"wheeler to go with the trident lump. But wheres the fun in that, if i wanted the easy route i wouldnt have been developing the trident over the last 5 years.
I sat on nicks bike when it was first being built and i found it comfy.
Mind u being 6" longer than my old chassis helped.
Lets see what happens in 2011.

Congrats on a great year for you and Vicky Eddy. C u next year.
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Re: CRMC New Eligibility Rules

Unread post by Eddy Wright »

I will watch your progress with interest Have a great season.
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Re: CRMC New Eligibility Rules

Unread post by jkr46 »

Eddy Wright wrote:Seems to me the guy's who run 10" wheels dont want the 13" inch wheel brigade to have a choice !

Ian, Page 447 Demon Tweeks new catalogue. Lists the Yokohama A048R has been described as a tyre ideal on both wet and dry surfaces. Quote " The A048R gives superior controllability when challenging the limit " ON BOTH DRY AND WET SURFACES" So to say it is only suitable for dry conditions is incorrect. I think Ian you should measure the contact patch on one of these tyres fitted to a 7" rim you will find it is exactly 5.5" bringing it within the CRMC rules.

I will be running a 13" BMW at some point next year and I’m happy with current tyres, the choice is Avon or Dunlop. I strongly disagree the outfits look under tyred, in fact in my opinion I think with 7" rims stretching the tyres they look over tyed!

To say cost is an issue with tyres when you own at least three classic outfits two of which are windle BMW’s that as far as I’m aware have never even seen the track and you keep posting on here your going to see Mike of MRE about another brand new chassis for your imp is a bit of a joke!
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Re: CRMC New Eligibility Rules

Unread post by jkr46 »

Eddy Wright wrote:Yes it has Simon. I think the IMPs with the 12" tyre was the ideal set up. 10" in the IMP is not ideal ! 13" far from perfect.
Put a 12" wheel in with a dunlop green spot then.
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Re: CRMC New Eligibility Rules

Unread post by jkr46 »

Eddy Wright wrote:Hi Ian.

Thanks for that it makes it clear.

However the situation still remains that teams running the 13x7 wheels are dependant on one tyre. There are no other all weather racing tyres available.

More and more teams are using 13" x 7" wheels including this years CRMC Champion. My new bike will have them, and I know Mike Richards is building a few that will join us next season.

My concern is not getting another inch of rubber on the track. It is this "What do we do if Avon cease production, have a strike, or some delay ?"

Should this happen we would lose 50% of the current grid, and I'm sure neither you or the CRMC would welcome that. The Yokohama fits a 13"x7" wheel measured accross the sidewalls it is the same width as the Avon, however the contact patch is 1" wider. In the name of common sense this tyre should be considered.

The current rules of a 7" rim width would stop the use of any wider tyre,and give the teams with 13" wheels more choice.
I think you will find this years champion Matt Kingsmill runs 5.5" wide wheels as all of Mikes chassis's run 5.5" wide wheels. Including the new outfits coming out next season.
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Re: CRMC New Eligibility Rules

Unread post by richard »

may I add my two pence worth. The classic club have a tyre gauge that the outfits run though, Ian has this gauge and it has been in use over many years, the tyre must not run over the edges of this gauge and if it does then the tyre is to wide and cannot run in the club. This gauge stops all the arguments as if it does not fit it does not run, also if you fit one of these 13 inch tyre on wider rims it will stretch the tyre and will give a bigger foot print on the floor and they that will be wider than 5.5 inches. At the first meeting ask Ian to run all the outfits though the gauge and clear up this problem.
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Re: CRMC New Eligibility Rules

Unread post by mrequipe »

mmm :roll: :roll:
This whole rim thing started quite a few years ago when an outit appeared with an f2 size rear wheel in it, fitted with the correct tyre. It looked ridiculous, so I think thats where Richards block came in ;) . It doesnt seem to have been used much lately :lol: I build mine on 5.5" rims which is one of the sizes Avon quote for the tyre, you can go wider if so desired. I am quite happy with 5.5" rim but if the customer wants wider he can now have it, with the rules allowing 7" rims :o
All new replica chassis should have a limit on them which Ian has now put at 7". I dont think a avon tyre with a 7" rim will go through the block, Then theres a problem, but up until bikes have been checked who knows :o ( I better check mine) :D :lol: There where outfits about in the 60s /70s about that had wide wheels but very few.
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Re: CRMC New Eligibility Rules

Unread post by richard »

The wheel gauge was in the club when Alan Bedford was in charge and was used when there was a problem such as this. it is a steel made gauge with steel sides and when used stopped all the arguments, It is the clubs gauge to the right size tyres and not the opinion of the man incharge, if anyone is not happy with another bike please get Ian to check it out with the gauge and if it fit no problem
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Re: CRMC New Eligibility Rules

Unread post by ynys-mon »

It was pointed out to Ian at Angelesey that a few bikes wheels looked wide :o He had the block with him but none were checked :? Nobody wants to stop anybody racing, the whole rim thing is getting out of hand :cry: A simple test as Richards says, it passes or it dont :(
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Re: CRMC New Eligibility Rules

Unread post by mrequipe »

Woh !! This isnt world championship stuff here, this is classic racing !! Supposed to be fun :D Its going to be a cracking year next year, so stop squabbling it'll end up like F2 :o The problem is the classic rules are to vague, and if you choose to exploit them you can :o floating brakes and all sorts ive seen ! I try not to take things to the limit, because I want to try to stay true to the name "CLASSIC" and I still get stick off the original 70s chassis owners then :lol:
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