Campy front brake tire clearance

[bluesea]

With front brake pads set to <1mm to rim, I have <2mm tire clearance with Neutron Ultra/ Conti 4000s 25c on a fork rated fork 28c.

How much more clearance will I get moving from a Chorus front to Dura Ace 9000?

[sandyrs]

With front brake pads set to <1mm to rim, I have <2mm tire clearance with Neutron Ultra/ Conti 4000s 25c on a fork rated fork 28c.

How much more clearance will I get moving from a Chorus front to Dura Ace 9000?

Depends where you're lacking clearance. Vertically?

[oldpotatoe]

With front brake pads set to <1mm to rim, I have <2mm tire clearance with Neutron Ultra/ Conti 4000s 25c on a fork rated fork 28c.

How much more clearance will I get moving from a Chorus front to Dura Ace 9000?

So, taking the brake off with wheel in there and ya gots lotsa clearance?

[donevwil]

The one set of 25mm Conti 4000s I had were very large, I believe about 26.5-27mm tall on my 23mm rims. The mold nubbins rubbed the top of my Enve 2.0. For comparison 28mm GP 4-seasons are about 26mm tall and cleared.

[bluesea]

Depends where you're lacking clearance. Vertically?


Although the Chorus brake arm angles down from the left, I'm measuring veritcally.

[bluesea]

The one set of 25mm Conti 4000s I had were very large, I believe about 26.5-27mm tall on my 23mm rims. The mold nubbins rubbed the top of my Enve 2.0. For comparison 28mm GP 4-seasons are about 26mm tall and cleared.

I was happily surprised (at first) that my 25c 4000s measured 25.5mm square.

[donevwil]

I was happily surprised (at first) that my 25c 4000s measured 25.5mm square.

I do wonder if my 4000s were 28s that were labeled 25. I guess it's possible.

[bluesea]

So, taking the brake off with wheel in there and ya gots lotsa clearance?


Roger for 25c, but just okay for larger 28c I think. The fork crown has about 8mm on the current set up. Im using hex wrenches with the flat side down.



P.S. I don't like Conti 4 Seasons anymore.

[bluesea]

I do wonder if my 4000s were 28s that were labeled 25. I guess it's possible.


I wouldn't doubt there's variations in tire dimensions, as I've had tight (mounting) 4000s that did not loosen in 1500mi. Plus there's your 23mm rim.

[Ttx1]

Variables are:
Tire
Fork
Brake
Rim
Tire pressure

In my case, I'm barely able to fit 28c Paselas on an Enve road fork with Campy SR dual pivot skeleton calipers. Ok @ 70psi, not ok at higher pressure. Enve clears fine - the brake is the issue.

Running H+Son Archetypes, so slightly on the wide side, which can effect tire profile.

I've heard the switch to a single pivot can buy a mm or two...

Schwalbe One clinchers are going on tomorrow, fingers crossed.

[teleguy57]

I put a small washer behind my SR dual pivot front and it gave me another couple mm of clearance. I can run an Ultremo 28 (measures about 29mm width on a TB-14) on an Enve 2.0 road fork with acceptable clearance (before adding the washer).

Good discussions with photos here (http://forums.thepaceline.net/showthread.php?t=122464&highlight=brake+clearance) and here (http://forums.thepaceline.net/showthread.php?t=139011&highlight=brake+clearance).

[bluesea]

^ Thanks for the links!