I believe the set screw you are talking about is for minor adjustments for the brake over the wheel. The Wingy is the piece that allows the caliper to be expanded to remove the wheel

>> I believe the set screw you are talking about is for minor adjustments for the brake over the wheel. The Wingy is the piece that allows the caliper to be expanded to remove the wheel

Thanks. But...

I'm not talking about the "centering" set screw. The one I'm wondering about is in the wing. It doesn't touch anything. And, why is a wing needed to spread the caliper to remove the wheel? Doesn't the return spring accomplish this when you loosen the cam lever on the cable?

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"100% of the people who confuse correlation and causation end up dying."

Different wingy thing he is talking about I think. Actually part of the pad, no? No idea what that is for.

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Justin in Austin, get it? :)

Cool races:
- Redman
- Desoto American Triple T

The set screw just holds the pad in place after you slide it into the groove in the calipers. Is that the set screw you are talking about. It is a minor piece, but I suppose if you went really fast in reverse and slammed on the brakes, without the set screw the pads would go shooting out into space like bullets... Could happen I guess.

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Justin in Austin, get it? :)

Cool races:
- Redman
- Desoto American Triple T

>> The set screw just holds the pad in place after you slide it into the groove in the calipers.

Thanks. But...

That's not the screw I'm talking about either. The wing is below the pad (and pad holder); the screw is in the wing and if it were longer would scrape the rim closer to the hub than the braking surface. (Follow the red arrow below.)

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"100% of the people who confuse correlation and causation end up dying."

>> The Wingy is the piece that allows the caliper to be expanded to remove the wheel.

Oops, Sorry ejohns, I misread your post. Justin's right, we're talking about different parts. What you called a wingy, I called a cam lever.

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"100% of the people who confuse correlation and causation end up dying."

it's only plastic - when it pops out you know that your pads are too worn!

I think the wingy is a holdout from the old days when there was a big wingy that was there to save your fingers when you were trying to center the brakes. several pad designs out there that don't have it.

When your pads are worn and the plastic makes contact with your rim, it'll make a heinous noise, prompting you to change your pads!

My bad. Looking on the Shimano Technical doc, they are calling it a tire guide????? But have to agree probably a wear indicator. I have emailed my brother at Shimano for more info

>> it's only plastic - when it pops out you know that your pads are too worn!

Thanks, cyclenutnz!

Ahhh! (light bulb goes on...)

That screw does look like it's plastic. With a really worn brake pad, it looks like it would contact the rim before the metal brake pad holder gouged the wheel.

Thanks all who responded. :-)

EDIT: Arrgh, two minutes late with this post. Thanks again everyone.

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"100% of the people who confuse correlation and causation end up dying."

I believe the wing is for heat dissipation. Not a big deal for most of us, but dropping from 100kph to 20kph to make that hard left coming out of a descent in the Alps is gonna heat up your brakes a lot.

I always thought the screw was something like a damper for vibrations from braking.

All these are just guesses though...

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"Non est ad astra mollis e terris via." - Seneca | rappstar.com | FB - Rappstar Racing | IG - @jordanrapp

>> I believe the wing is for heat dissipation. Not a big deal for most of us, but dropping from 100kph to 20kph to make that hard left coming out of a descent in the Alps is gonna heat up your brakes a lot.

Now that's interesting! Hadn't thought of that either...

But, the surface area of the wing seems negligible compared to the rest of the brake caliper and rim.

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"100% of the people who confuse correlation and causation end up dying."

Actually, it creates more downforce on the pads at higher speeds so that it requires less finger strenght to apply the brakes. Kind of like the wings on race cars.



Chris

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Chris
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“Life should not be a journey to the grave with the intention of arriving safely in a pretty and well preserved body, but rather to skid in broadside in a cloud of smoke, thoroughly used up, totally worn out, and loudly proclaiming "Wow! What a Ride!”
― Hunter S. Thompson,

the wings also guide the wheel in place when you are replacing it on the run

>> it creates more downforce on the pads at higher speeds so that it requires less finger strenght to apply the brakes. Kind of like the wings on race cars.

Ummm, Riiiight. Next you'll be telling me that Floyd's aerobar position creates lift on the front wheel to reduce rolling resistance.... ;-)

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"100% of the people who confuse correlation and causation end up dying."

You believed Rappstar but not me :(



Chris

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Chris
*********************
“Life should not be a journey to the grave with the intention of arriving safely in a pretty and well preserved body, but rather to skid in broadside in a cloud of smoke, thoroughly used up, totally worn out, and loudly proclaiming "Wow! What a Ride!”
― Hunter S. Thompson,

>> You believed Rappstar but not me :(

Well...I guess I just believe that he has actually ridden 100kph. ;-)

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"100% of the people who confuse correlation and causation end up dying."

Exactly. It's just two sloping surfaces to guide the tire back between the brake pads so that you can effect a quick tire change after a flat.

They're ramps which help the tire drop back into place on its own when you replace the wheel rather than needing to put a hand up there every time to ensure the tire goes between the pads and doesn't get jammed against the pad holders.