robintrial Posted April 12, 2011 Report Share Posted April 12, 2011 hello trials riders as in the title stands would it be possible to have the über grind? what i mean is that you will not have to grind anymore because that would be a great invention! Quote Link to comment Share on other sites More sharing options...
dann2707 Posted April 12, 2011 Report Share Posted April 12, 2011 If you overcome friction then yes. but you erm, kind need friction for it to be a brake! 2 Quote Link to comment Share on other sites More sharing options...
Martin Reynolds Posted April 12, 2011 Report Share Posted April 12, 2011 What dan said. grinds go smooth because of the friction from the brake pad. Quote Link to comment Share on other sites More sharing options...
multi tasking male Posted April 12, 2011 Report Share Posted April 12, 2011 (edited) i get what you meen, if maybe they could sell a rim that has a built in grind, made in the factory and reinforced some how or you could have a aluminum ring thats 3mm thick or something ? you buy it, attach it to your rim using bolts that are square and fit into square holes so they dont move and there flush fitting, do it up on the inside with a nut and so its a flush fit onto the inside also, then grind the ring when its on the wheel and the face of the bolts will grind aswell then when the grind goes dead you grind it again then when the second one goes dead you buy a new ring sounds like a uber grind or replacaple grind if you ask me much cheaper than a new rim chris Edited April 12, 2011 by multi tasking male Quote Link to comment Share on other sites More sharing options...
6ft-midget Posted April 12, 2011 Report Share Posted April 12, 2011 (edited) A replaceable grind surface would increase weight and cost. Unless they cost like 50p each it would be cheaper and a lot less hassle to just grind a rim. Also a rim with a permanent 'grind' would eat pads like crazy. There has to be some give somewhere. Edited April 12, 2011 by 6ft-midget Quote Link to comment Share on other sites More sharing options...
Sam T Posted April 12, 2011 Report Share Posted April 12, 2011 i get what you meen, if maybe they could sell a rim that has a built in grind, made in the factory and reinforced some how Ceramic? Quote Link to comment Share on other sites More sharing options...
multi tasking male Posted April 12, 2011 Report Share Posted April 12, 2011 it would be cheaper in the long run, it would to buy it all but if have a new rim every year thats £40 for a good one or buy a aluminum ring for £10 it would soon all add up, but if you have the rim very thin and half the thickness of a normal sidewall and then it will be reinforced by the ring it would be the same weight, the only added weight would be the bolts and nuts but they could be light weight aswell if there chromoly or some thing Quote Link to comment Share on other sites More sharing options...
Dan6061 Posted April 13, 2011 Report Share Posted April 13, 2011 Onza once tried this with a knurled rim. Would've lasted a long time, but it ate pads very quickly! Plus the tooling involved to make each rim was very time consuming and costly, so they scrapped the idea. Best thing to do is just go dual disc. Quote Link to comment Share on other sites More sharing options...
Luke Rainbird Posted April 13, 2011 Report Share Posted April 13, 2011 Dual disc on a mod, brakeless on the 24" or a vee on big wheels - braking issues? What braking issues?! Quote Link to comment Share on other sites More sharing options...
Bigman Posted April 13, 2011 Report Share Posted April 13, 2011 Plasmatic used to do a ceramic type coating on DX32 rims (Atleast 6-7 year ago mind!), there was 3 different levels of harshness, the harshest one would make black magura pads work like the best trials pad from what I had heard but they would wear down in a week or so! You could make a mega harsh grind, but it would not actualy be beneficial to brake power, light to medium grinds provide the best feeling and working brake for most conditions, the only time that a mega harsh grind might be needed would be in wet and muddy conditions. And as has been said already any grind will wear due to the brake pad rubbing the surface of the rim. Adam Quote Link to comment Share on other sites More sharing options...
robintrial Posted April 13, 2011 Author Report Share Posted April 13, 2011 thanks for the replys guys it just would be a greate invention if they would find an alternative though Quote Link to comment Share on other sites More sharing options...
liam n Posted April 13, 2011 Report Share Posted April 13, 2011 well i always thought since the age of 5 that the disc brakes on the front of my MTB had holes in because when you pull the lever a metal bolt goes through it stopping the wheel dead...that was not the case BUT it could work you'd just need some seriously strong joins and some seriously strong bolt... Quote Link to comment Share on other sites More sharing options...
Laurence--Trials Posted April 13, 2011 Report Share Posted April 13, 2011 it would be cheaper in the long run, it would to buy it all but if have a new rim every year thats £40 for a good one or buy a aluminum ring for £10 it would soon all add up, but if you have the rim very thin and half the thickness of a normal sidewall and then it will be reinforced by the ring it would be the same weight, the only added weight would be the bolts and nuts but they could be light weight aswell if there chromoly or some thing An alu' ring... isn't that a rim anyway? just without a middle as such? two sides no middle.. it'd cost fairly similar to be honest, meaning it'd be more expensive surely? Quote Link to comment Share on other sites More sharing options...
CalopS Posted April 13, 2011 Report Share Posted April 13, 2011 Onza once tried this with a knurled rim. I remember that, shame it didn't work Quote Link to comment Share on other sites More sharing options...
dann2707 Posted April 13, 2011 Report Share Posted April 13, 2011 well i always thought since the age of 5 that the disc brakes on the front of my MTB had holes in because when you pull the lever a metal bolt goes through it stopping the wheel dead...that was not the case BUT it could work you'd just need some seriously strong joins and some seriously strong bolt... Hahaha I though the exact same! Quote Link to comment Share on other sites More sharing options...
multi tasking male Posted April 13, 2011 Report Share Posted April 13, 2011 (edited) An alu' ring... isn't that a rim anyway? just without a middle as such? two sides no middle.. it'd cost fairly similar to be honest, meaning it'd be more expensive surely? yeah but it wouldnt take as much labout to build,it would just be cut a ring from a aluminium sheet with the diameter of 20", 19", 24" and 26" there must be some way of getting the costs down, surely ? Edited April 13, 2011 by multi tasking male Quote Link to comment Share on other sites More sharing options...
Luke Rainbird Posted April 13, 2011 Report Share Posted April 13, 2011 It'd be silly expensive to build additional rings and fittings as opposed to just stamping out a rim dude For what you pay for a rim, even if you feel the need to grind your rim frequently, they should last you a good while. If you're grinding so frequently that your rim doesn't last, there's most likely be something wrong with either your brake setup or the material the rim is made from! Quote Link to comment Share on other sites More sharing options...
robintrial Posted April 13, 2011 Author Report Share Posted April 13, 2011 It'd be silly expensive to build additional rings and fittings as opposed to just stamping out a rim dude For what you pay for a rim, even if you feel the need to grind your rim frequently, they should last you a good while. If you're grinding so frequently that your rim doesn't last, there's most likely be something wrong with either your brake setup or the material the rim is made from! I just have 6 grinds in one year so i don't grind that frequently it was just a thought ,I don't have problems with buying new rims and the brake is super good atm thanks anyway Quote Link to comment Share on other sites More sharing options...
James Quigley Posted April 13, 2011 Report Share Posted April 13, 2011 I've has my rear rim for going on 4 years now, grind it every 3 months or so. No need for anything to outlast that really. Quote Link to comment Share on other sites More sharing options...
Matthew62 Posted April 13, 2011 Report Share Posted April 13, 2011 Maybe i'm missing something but i had one light/medium grind on my rim two/three years ago i haven't touched it since and i use heatsink yellows in normal backings, no booster and i've never had any issus with the brake holding ever and i mean ever. It just holds and holds and holds..... I wonder if people grind too frequently so the brake never really beds in as the braking surface is always in a state of change. Again: 2/3 year old grind. Heatsink Yellows. Locks every single time. Quote Link to comment Share on other sites More sharing options...
Davetrials Posted April 13, 2011 Report Share Posted April 13, 2011 Rowan johns managed with black pads on a smooth rim, i think its down to the rider.. Quote Link to comment Share on other sites More sharing options...
dave33 Posted April 14, 2011 Report Share Posted April 14, 2011 I remember years ago a mate used a hacksaw to do some small groves in his rim maybe 1mm deep 5mm apart kind of worked.. Maybe it's possible to do but not really worth while in the long run, just grind your rim doesn't take long Quote Link to comment Share on other sites More sharing options...
JD™ Posted April 14, 2011 Report Share Posted April 14, 2011 Smooth rim, zoo pads. No issues. If I do have issues I blame my riding (weight distribution) and not the brake. Sorted. Quote Link to comment Share on other sites More sharing options...
Matthew62 Posted April 14, 2011 Report Share Posted April 14, 2011 It bloody well ain't weight distribution when you jam on your front brake at speed. That's just a fine mixture of bravery and fear. Quote Link to comment Share on other sites More sharing options...
dave33 Posted April 14, 2011 Report Share Posted April 14, 2011 Smooth rim, zoo pads. No issues. If I do have issues I blame my riding (weight distribution) and not the brake. Sorted. What about rain ? Quote Link to comment Share on other sites More sharing options...
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