Jamminatrix

I am talking the physical shaping of the fork dropouts. Where the bottom brake bolt standoff needs to be is where the dropout is.

See here:



The only way around would be shaping the dropouts on backside and extreme angle fork, like the Trek Domane...but that's not optimal at all for MTB suspension.

Please provide a real citation and proof of this actually occurring. Always see this phobia statement popup, but never any verifiable proof in all my years.

Doesn't matter, rider weight on the front wheel keeps the axle in the dropouts.

cobba

No idea what's going on with the those images with the red arrows.

If that's the case, I'm sure that you wouldn't mind removing the qr skewer from a bike with downwards pointing dropouts and a front disc brake and then going for a ride, make sure to get some speed up and apply plenty of force to the front brake.

Don't forget to video it too.

* If you're silly enough to do this, I take no responsibility for the outcome.

gsa103

A rider on a group ride I attended was seriously injured when her front wheel feel off, due to improperly tightened QR, when she hit a bump. It can happen, but its extremely rare.

I will personally vouch for the disc brake issues with the lawyer tabs. I had tons on issues with the disc brakes on the mtb rubbing, until I discovered the secret. Install the wheel with the QR resting on the tabs (not at the top of the slot). My weight wasn't enough to cause the wheel to slip up in the slot, but the braking force was enough pull the wheel down if it was fully seated in the dropout.

Jamminatrix

Doesn't take a potato to see the dropout and brake mounting stud would interfere if they're on the same side.

If I do it, then you'll come back and say remove the QR all the way, then I'll come back again, and round in circles with excuses.

BTW, still waiting on those cases and citations.

The wheel came out because she had discs and hit the brakes (what we're discussing)?
Or the wheel came out because she hit a bump, the fork blades split open without QR tension, and the wheel unweighted?

I've had a buddy do a front wheelie at the trailhead and his front wheel fell out because he didn't tighten the skewer...but that's irrelevant to this disc claim.

cobba

**********


Surly you're not stupid enough to do it, you'd have to be mad to ride without a qr skewer.

JohnDThompson 

He's illustrating that the offset dropout will interfere with the caliper mounting plate, if the manufacturer were to try to move the caliper to the front of the blade without changing any of the rest of the fork design. But by having the dropout in line with the fork blade, and gaining the necessary offset by other means (offset crown and/or blades angled forward of the steering axis) the necessary clearance for the caliper mount could likely be attained on the front of the blade.

cobba

So that's what those red arrows were about.

Post mounts like IS mounts can be put on the front of a fork leg, it's all about measurements from the center of the axle.

As long as the two brake mounts are a certain distance from the axle and a certain distance apart it can be done.

Here's couple on rough additions to a tech drawing to show how front post mounts would look.



Here's what a IS mount on the front looks like.

LesterOfPuppets

Use bigger rotor?

fietsbob

German Tout Terrain makes forks with a front facing dropout opening

https://cdn.mos.bikeradar.imdserve.co...76m-700-80.jpg

but NB; still the QR skewer head ends lay in a recess .

Jamminatrix

The industry seems to phasing out IS mounting, however. Very much like open dropouts are being phased out with thru axles on disc brake bikes. In another five/ten years, all this discussion will be a moot point; unless we are discussing entry level and Walmart bikes - which do sell discs and quick releases (and think of the recalls and frivolous lawsuits they deal with, and there have been no reported issues).

Right, for a rigid fork with IS tabs and 160 Rotors(?). Road bikes are seemingly going Shimano flat mount calipers (which actually do favor the potential of front mount) and 140 Rotors.

In theory if the fork was designed so the blades were aggressively swept outward, and the dropouts were on the backside, it would work (like the Trek Domane fork). But it would not work for suspension forks that need to have straight stanchions. The biggest issue I see for road bikes is that word the 'Big S' company has infected the industry with: aero.

cobba

Potato.

asmac

I try to be extra careful whenever I ride upside down with the QR skewer loosened or removed and the lawyer lips filed off by my libertarian friend. So far so good.

cobba

It happens the right way up too, the person who made that video made another one too.

https://www.youtube.com/watch?v=losWKtO69q4