justfuzzit Posted June 15, 2006 Report Share Posted June 15, 2006 (edited) Does anyone make pre "ground" rims? Or rims that are molded to be a good shape instead of smooth. (not sure how to say it) Wouldn't it be lighter to do that because then you wouldn't have to make as thick of sidewalls? They could also be treated somehow to hold the shape better (of the "grind") Does anyone do this? Has it been tried and just didn't work? Good or bad idea? Why? Edited June 15, 2006 by justfuzzit Quote Link to comment Share on other sites More sharing options...
adamtrials Posted June 15, 2006 Report Share Posted June 15, 2006 (edited) A ) Not everyone likes grindsB ) The current thick sidewall probably helps to make the rim stronger and last more grinds.C ) I doubt you could treat it to make it any betterBasically I doubt a company is gonna pour loads of money into r+d for a product that noteveryone would want/ is not required, afterall I dont know anyone that has a problem with grinding rimsor if you do/ are lazy trials shops do them for a quid or so.Call JML, they specialise in pointless products for lazy people... Edited June 15, 2006 by adamtrials Quote Link to comment Share on other sites More sharing options...
justfuzzit Posted June 15, 2006 Author Report Share Posted June 15, 2006 Well i know there is such thing as hardened alluminum. But that might be brittle. I am not posting this because I dont want to do the work, I am posting because I think that it might last longer and be better. Quote Link to comment Share on other sites More sharing options...
N.Wood Posted June 15, 2006 Report Share Posted June 15, 2006 I think one of the problems would be consistency.You would need to do it by hand, and this means that each grind will be slightly different as the grinding disk wears out and the poor soul employed as 'rim grinder-er' gets bored out of skull doing it. There's also some legal shit that could occur, with daddy buying his son a ground rim, then his brake pads wearing out quick and daddy filing a law suit. Hardened alu could pose huge problems in the bending and extruding process that goes into making a rim. There was a couple of pre-production rims that had a machine-ground knurled surface, but it was too much effort for not much gain, in that the knurl was shit and ate pads for breakfast. Quote Link to comment Share on other sites More sharing options...
sexymike Posted June 15, 2006 Report Share Posted June 15, 2006 onza used to do it Quote Link to comment Share on other sites More sharing options...
blinky Posted June 15, 2006 Report Share Posted June 15, 2006 (edited) A ) Not everyone likes grindsB ) The current thick sidewall probably helps to make the rim stronger and last more grinds.C ) I doubt you could treat it to make it any betterBasically I doubt a company is gonna pour loads of money into r+d for a product that noteveryone would want/ is not required, afterall I dont know anyone that has a problem with grinding rimsor if you do/ are lazy trials shops do them for a quid or so.Call JML, they specialise in pointless products for lazy people... A ) People who dont like grinds wouldnt buy them (nobody's forcing them) and imo are missing out B ) A thick sidewall wouldnt be needed for grinds if the surface was like that of a grind anyway. Also, a grind basically scratches the surface of the rim to make it rough, if the rim was surfaced like a knurled finish, but maybe in a radial pattern, this would provide more friction and would last longer, even with hard pads.C ) Why would you want to make it any better?Trials shops (for example tarty bikes) refuse to grind an anodised rim due to the masses of dust it gives off, if a company did research into a product like this, then rims like the echo rims would have the performance of a grind, but would be able to keep the anodized finish on the rim sidewall aswell Edited June 15, 2006 by blinky Quote Link to comment Share on other sites More sharing options...
Walleee Posted June 15, 2006 Report Share Posted June 15, 2006 I think the main reason is because it's not easy to do it by machine.To have anything resembling a knurl, you'd really have to have a cnc machine cutting the pattern, or a huge chuck in your huge lathe. It's just not really practical to do it to a consistant standard/quality, and as such, is something that's left up to the buyer to decide on how they want it to be done.If manufacturer's did grind their rims, would they have to start having light, medium and harsh grinds to allow for those who are REALLY fussy fanny's?Just read the other replies, and someone said consistency too, so yeh, consistency is the problem....For more on the machining shite - http://www.trials-forum.co.uk/forum/index....showtopic=66351 Quote Link to comment Share on other sites More sharing options...
adamtrials Posted June 15, 2006 Report Share Posted June 15, 2006 A ) People who dont like grinds wouldnt buy them (nobody's forcing them) and imo are missing out B ) A thick sidewall wouldnt be needed for grinds if the surface was like that of a grind anyway. Also, a grind basically scratches the surface of the rim to make it rough, if the rim was surfaced like a knurled finish, but maybe in a radial pattern, this would provide more friction and would last longer, even with hard pads.C ) Why would you want to make it any better?A ) Everyone buys the same rim, then they either grind it or they dont meaning the companyonly have to produce one rim, i.e. cheaper and less effort than producing a ground and non ground rim.Also they are going to sell less of each individual type of rim meaning more development cost : purchaser ratioB ) Thin sidewall = dents?C) That was in reference to his question about hardening / treating them to make grind last.And if someone did make one then people would probably just bitch that its crap and not buy them anyway... Quote Link to comment Share on other sites More sharing options...
onzatprodude Posted June 15, 2006 Report Share Posted June 15, 2006 if you buy your rim from tarty you can get it ground for £1 so i suppose you could class it as a pre ground rim Quote Link to comment Share on other sites More sharing options...
justfuzzit Posted June 16, 2006 Author Report Share Posted June 16, 2006 What i mean by pre "ground" is not ground at all. Just molded to have a rough surface. Quote Link to comment Share on other sites More sharing options...
adamtrials Posted June 16, 2006 Report Share Posted June 16, 2006 Its not going to work... Quote Link to comment Share on other sites More sharing options...
Simpson Posted June 16, 2006 Report Share Posted June 16, 2006 What i mean by pre "ground" is not ground at all. Just molded to have a rough surface.but like when a grind gets worn out you get a new one dont you - what happens with this new miricle rim =P lol Quote Link to comment Share on other sites More sharing options...
justfuzzit Posted June 17, 2006 Author Report Share Posted June 17, 2006 Its not going to work...Accually it would if someone made it. Maybe even a sand paper like texture. Thanks for the negativity though. Quote Link to comment Share on other sites More sharing options...
justfuzzit Posted June 17, 2006 Author Report Share Posted June 17, 2006 (it wouldnt let me edit, so im posting again)like this Quote Link to comment Share on other sites More sharing options...
Onza Kieron Posted June 17, 2006 Report Share Posted June 17, 2006 That is the best drawn wheel I have ever seen on here, it's perfect, its round and even the spokes are built three cross. Pity you didnt put nipples on. Quote Link to comment Share on other sites More sharing options...
matt! Posted June 17, 2006 Report Share Posted June 17, 2006 if they did make a rim like that it would probally where you pads down faster than on a light grind or smooth rim! matt Quote Link to comment Share on other sites More sharing options...
Tom Booth Posted June 17, 2006 Report Share Posted June 17, 2006 Did'nt plazmatic do that plasma coating or something? was basically a rediculously harsh grind, that never wore out?? (wore koxx browns out in days or something?) I dunno' anything about it, except that^ but it might be helpfull to this thread? Quote Link to comment Share on other sites More sharing options...
Gavyn. Posted June 17, 2006 Report Share Posted June 17, 2006 Did'nt plazmatic do that plasma coating or something? was basically a rediculously harsh grind, that never wore out?? (wore koxx browns out in days or something?) I dunno' anything about it, except that^ but it might be helpfull to this thread?yeah i saw an advert for that somewhere they were charging around the £200 mark for one wheel i don't think this would work, mainly because the alu which the companies use probably comes in long flat sheets the sidewalls are already polished so the company would have to add the grind, knurl whatever to the surface, theyed then slap on another 10 quid onto the price on the rim. most people are happy with grinding there rim themselves if not get it done by tarty when you buy the rim it's much better than paying loads for some company to do what you can do for free. Quote Link to comment Share on other sites More sharing options...
pollocks Posted June 17, 2006 Report Share Posted June 17, 2006 surely i wouldn't be hard for the companys to do this as its done in the after market car parts all the time and has been done for years these are mine on the fiesta rs turbo of mine and they ain't cracked or anything and get loads of abuse they use them in motorsport too such as wrc so get subjected to more heat and the likes than a trials bike so i would have thought these grooves for cleaning the pad/dispersing water/ more bite etc would be down to a strength of the rim thing thins parts around the rim were they've been pre ground could be a weak spot so the companys wouldn't want to warranty against this would they so am thinking that its a pure cost thing really not enough money in it for them Quote Link to comment Share on other sites More sharing options...
Wright Pads Posted June 17, 2006 Report Share Posted June 17, 2006 Eh??WTF you going on about you tart. Them disc aint ground or anyhting durying manafacture. EBC turbogrove is just machined, Zinc plated by midland plating a guy called bob and then sent back and a l;ass called Ali packs em up.Right the real reason why okay no grind is done by the manafacture of rimsWhen you grind a rim your grinding way the surface. Thus can go worng and you can take mass section out.Also spokes under tensione are what make the rim strong, if you have a rim to hand push on it and se eit bend and everything, once built with spoke you have to twat it hard as hell to do soSo if you were grinding away you'd bend the rim, thus is due to many reason but one being how the hell would you hold the rim.Fact have any of you got a clue how they make rims?Rim's cost enough as is rightAdding grinds at manafacturing will add cost, why, take a machine or a guy to do it, thus needs creating or training and then skills, the guy will fail on a few rims now and then and the machine will cost mega bucksIt'll also cut half there market off, if you see a rim just made you get 100% of the market but if you do em grind you'd only in theroy get 1%. Thats life or death for you and the company.The fact is a grind is not for xmas it's for short rididng duration then you re=-grind...so erm yeah you got to buy a grinder. You don;t send the rim back to be ground by the manafacture do you..nopeSo for £30 get a really gfood grinder and spear discs, also £30 get a f**king wicked bit of eneginering being a rim thats amde for yuo ass to crush in time. get it built and then grind it. Hope that clears it upOT you lot wander why i haven't been about or am leaving the seen. Go look arounder for you self. Bunch of f**king fags that bitch and can't ever think outside the bloody box. Quote Link to comment Share on other sites More sharing options...
pollocks Posted June 17, 2006 Report Share Posted June 17, 2006 there not ebc's fella am affended by that lol they warp far too easily lol there ap racing ones and off an escort cosworth fitted on my fiesta lol Quote Link to comment Share on other sites More sharing options...
Wright Pads Posted June 17, 2006 Report Share Posted June 17, 2006 I'll upset you more, AP Racing have em made by EBC!!! There is 9 months left on there contract with EBC Quote Link to comment Share on other sites More sharing options...
pollocks Posted June 17, 2006 Report Share Posted June 17, 2006 back to topic whilst i go cry in the corner Quote Link to comment Share on other sites More sharing options...
Wright Pads Posted June 17, 2006 Report Share Posted June 17, 2006 End of, they don't make pre ground for cost reasons and then it steps form there on Quote Link to comment Share on other sites More sharing options...
future orange 660 Posted June 18, 2006 Report Share Posted June 18, 2006 it seems the infamous pete wright is back under the wright pad illusion.just buy a ceramic rim.. if you can afford the extra £30 they want for them.only down side is they dont do it on rims wider than the ex721/d521 Quote Link to comment Share on other sites More sharing options...
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