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View Full Version : why are four-bolt mounts...


Bryan
08-04-2007, 05:58 PM
welded to the top and not to the bottom of the seatstay? most frames have a built in booster nowadays, but it's necessary to run at least a two-bolter anyways to protect the crossover. why not save weight and gain some extra clearance by putting them underneath the stays?

Sir_Crackien
08-04-2007, 06:55 PM
probaby has to do with that the bolts would be pulled on in that configuration

Oskar
08-04-2007, 07:07 PM
and the cranks will hit them

psyber_0ptix
08-04-2007, 11:54 PM
why not have the 4 bolts mounted 180 from where they are now? the forces would be pusing against the upper stays instead of pulling away (wen backhopping and rear wheel moves etc)

shouldnt make a difference, the only risk is cable/hose routing

Ebon Dragon
08-05-2007, 12:10 AM
and the cranks will hit them

chronic
08-05-2007, 04:34 AM
On a 128mm bb, my cranks dont come close to my brakes on an echo rim.

If I had to make a drunk guess, having the brakes on the top of the seat stay is better than on the bottom. As on the top, when you brake, you're forcing your pads into the rim with is turning into the frame. Which in my mind pulls especially the furthest pad point into the rim causing more friction.


On the bottom, sure, the side of the pad closest to the frame will still hit the turning rim and want to get sucked down, but with the bolts facing down, regardless of which end of the pad you look at. They're going to be forced outwards somewhat. Top of the frame, brakes get sucked in more so than forced away.

Correct me if I am wrong, but thats how I look at it. Which in my mind too, is why you see some forks with maggie mounts on the back side of the fork.
Why they dont all do that, maybe there are clearance issues with your feet, or the frame...
But on the back even with new pads, on my simtra, My brakes dont come close to the cranks.

Cryo-Cube
08-05-2007, 11:14 AM
because they are lazy.

chronic
08-05-2007, 02:49 PM
^Thats probably it more than anything.

Ebon Dragon
08-05-2007, 03:06 PM
On a 128mm bb, my cranks dont come close to my brakes on an echo rim.

If I had to make a drunk guess, having the brakes on the top of the seat stay is better than on the bottom. As on the top, when you brake, you're forcing your pads into the rim with is turning into the frame. Which in my mind pulls especially the furthest pad point into the rim causing more friction.


On the bottom, sure, the side of the pad closest to the frame will still hit the turning rim and want to get sucked down, but with the bolts facing down, regardless of which end of the pad you look at. They're going to be forced outwards somewhat. Top of the frame, brakes get sucked in more so than forced away.

Correct me if I am wrong, but thats how I look at it. Which in my mind too, is why you see some forks with maggie mounts on the back side of the fork.
Why they dont all do that, maybe there are clearance issues with your feet, or the frame...
But on the back even with new pads, on my simtra, My brakes dont come close to the cranks.

I think that only applies to when your wheel is spinning forward though (coasting etc, in which case you shouldn't be using your trials brakes anyways). If you land on the edge lets say from a tap or a gap your wheel will want to move backwards, so if you have the mounts under the stays the brakes will push into the frame.

spoke2570
08-06-2007, 12:11 AM
Man it would be a bitch to adjust under-stay Maggies, mod frames especially.

WhiteRavenKS
08-06-2007, 12:28 AM
because of the same reason that you get ass-pee when you eat too much taco bell.

Keith Courage
08-06-2007, 01:18 AM
I think its less that they are lazy, more that riders are lazy.

If maggie mount were mounted to the underside of my stays it would only push me to buy a v mount frame.

Ebon Dragon
08-06-2007, 01:27 AM
If there really is enough room there to do it, I would run it. Better hold, you wouldn't have to deal with crossovers breaking and I would imagine it would be stiffer in that location too. Don't know how you would fit a built in booster in there though, so maybe not.

bushlawyer
08-06-2007, 01:55 AM
built in boosters are gay and don't work.

plus the weight reduction would be about 27 times less than I could give a toss.

trialsrider50
08-10-2007, 01:55 PM
many newer frames wouldn't have the clearance to install a system on the opposite side. and if you don't like running a two bolter. don't. you shouldn't ever hit your crossover anyways. get a stainless braided one if you care that much.

manimal
08-10-2007, 02:48 PM
because of the same reason that you get ass-pee when you eat too much taco bell.

hahaha funny I was just talking about ass piss not too long ago..

WhiteRavenKS
08-10-2007, 04:15 PM
hahaha funny I was just talking about ass piss not too long ago..

great minds... :h5:

muddyfox
08-12-2007, 08:36 AM
.

Keith Courage
08-13-2007, 04:05 PM
dude more pics of that bike plZ

toyota200x
08-13-2007, 04:29 PM
I also love the look of these bikes.

http://www.observedtrials.net/album/data/645/medium/DSC09160.JPG
http://www.observedtrials.net/album/data/500/medium/q1.JPG

A mod
http://www.observedtrials.net/album/data/645/medium/q.jpg

AgrAde
08-13-2007, 07:50 PM
the maggies on that stock look like they'd be awesome for breaking my ankles off

Cryo-Cube
08-13-2007, 08:30 PM
unless your ankles are sticking further out than your cranks you should have no problems.
If your ankles stick further out than your cranks, you should:
a) see a dock
b) not be able to ride anway since your ankles would hit your cranks all the time.

stefan
08-13-2007, 09:40 PM
why don't women have tits and ass on the same side ?

bouncingbabyboy
08-13-2007, 11:02 PM
Do they have an english website?

Gaz
08-13-2007, 11:11 PM
Doesn't that stock frame say Magnesium on it? If so is it?

bouncingbabyboy
08-14-2007, 12:05 AM
How rigid is the area around the brake. A lot of new bikes have the built in brake brace. Is there room to add a brace under there?

spoke2570
08-15-2007, 01:16 AM
A built in brace only takes care of the frame side of things. Stress just gets moved out to 4 each 5mm water bottle bolts. Top and bottom bracing is the only way to go.