A Few Questions... (Well, 7)

[B0LT0N]

Hello all, i just have a few questions i would like to ask. Basically i am grinding my own rim tomorrow for the first time, i have watched the TNN and Tartybikes videos on rim grinding but they both do some things different, so my questions are:

Do i fully remove everything so i just have a rim, or shall i grind my rim while it's sill on the bike? My main concern is cutting into the tire some how?

Is there a lot of drag when grinding i.e. will my angle grinder feel as if it wants to pull away?

How will i know when i have ground my rim well enough?

Do i even have to grind my rim for TNN LGM pads on a rear magura? Or is it better to leave it?

How long will my grind last if i ride 4 days a week?

What disc shall i use?

For a sharp medium grind shall i use a thin disc at about a 45 degree angle, this is what TNN suggests you do?

I am going to be running a rear magura with TNN LGM pads if this makes any difference, TNN say i should do a sharp medium grind for best performance, both videos i have referred to can be found below.

(TNN)

http://www.tartybikes.co.uk/media.php?group=guides&id=2 (Tartybikes)

If you wondering what rims i have, well there stock Saracen rims on my mod so i think they are both 20", that as much as i know about them.

Thanks

EDIT: My dad is certain that this will ruin my rim, don't ask me why, is it just him being stupid? He doesn't even know what a trials bike is, hes just had experience with motor bikes and old mountain bikes lol

Edited July 10, 2010 by B0LT0N

[LukasMcNeal]

Do i fully remove everything so i just have a rim, or shall i grind my rim while it's sill on the bike? My main concern is cutting into the tire some how? As long as the tire is held/clamped away youll be fine

Is there a lot of drag when grinding i.e. will my angle grinder feel as if it wants to pull away? No, ive certainly never felt this!

How will i know when i have ground my rim well enough? Run your finger along the rim and check the roughness, all in all depends on the grind type but usually only have to go over the rim once.

Do i even have to grind my rim for TNN LGM pads on a rear magura? Or is it better to leave it? I would recommend a grind

How long will my grind last if i ride 4 days a week? I couldnt really say but it wont suddenly just "disappear" !

What disc shall i use? Depends on the grind really but a more expensive disc will be better than a cheap one you get with the grinder

For a sharp medium grind shall i use a thin disc at about a 45 degree angle, this is what TNN suggests you do? Yes it will be fine

[PeanuckleJive]

EDIT: My dad is certain that this will ruin my rim, don't ask me why, is it just him being stupid? He doesn't even know what a trials bike is, hes just had experience with motor bikes and old mountain bikes lol

My dad said that when I first ever did a grind on my rim, It's because he doesn't understand why it's necessary I guess

You're not taking that much material off, unless you do it wrong and grind for far too long. All you're doing is roughing up the surface to make your rim last longer

Most people egg or flatspot their rim before the time comes that theres isn't enough material left to grind

[B0LT0N]

What disc shall i use? Depends on the grind really but a more expensive disc will be better than a cheap one you get with the grinder

I mean, are there different types of disk i.e stone grinding/cutting metal grinding/cutting etc etc, i know to use a thin one, but what type? I'm using my dads angle grinder so i just need to know what sort of disc to ask for as he has lots, plus will i have to clean the disc before hand or anything?

Thanks

P.S. it wont let me quote you for some reason?

[PeanuckleJive]

What disc shall i use? Depends on the grind really but a more expensive disc will be better than a cheap one you get with the grinder

I mean, are there different types of disk i.e stone grinding/cutting metal grinding/cutting etc etc, i know to use a thin one, but what type? I'm using my dads angle grinder so i just need to know what sort of disc to ask for as he has lots, plus will i have to clean the disc before hand or anything?

Thanks

P.S. it wont let me quote you for some reason?

Metal cut off disc is what I used when I ground my rim last, about 3mm thick

as for "a more expensive disc with be better", It doesn't really make a difference to be honest, I've used some really cheap discs in my time and they still roughen up your rims the same, I guess an expensive one will last longer but you have to do a LOT of grinds to wear a disc down

Edited July 10, 2010 by PeanuckleJive

[LukasMcNeal]

Metal cut off disc is what I used when I ground my rim last, about 3mm thick

as for "a more expensive disc with be better", It doesn't really make a difference to be honest, I've used some really cheap discs in my time and they still roughen up your rims the same, I guess an expensive one will last longer but you have to do a LOT of grinds to wear a disc down

True, but with my argos one the discs were actually dangerous, it was grinding and parts of the disc were flying off! So I got some decent ones!

[PeanuckleJive]

True, but with my argos one the discs were actually dangerous, it was grinding and parts of the disc were flying off! So I got some decent ones!

That was the instructional DVD disc