How do I increase the clearance on rear rim brake?

[MichaelW2]

I'll try narrower tyres.

I just checked and the current giant tyres are 28mm and look bigger than the 28mm conti gp5000 I have on another bike. I'll get some 25mm continental and hope for the best.

28mm is the most variable if any tyre size.

 

[cougie uk]

Saw a few mm off the brake blocks ?

That's not the issue

 

[Cycleops]

That's not the issue

Yeahbut I guess the reasoning is that a few mils off the blocks would pull the calliper a little higher but it would be very marginal.

 

[C R]

Yeahbut I guess the reasoning is that a few mils off the blocks would pull the calliper a little higher but it would be very marginal.

How?

 

[Spiderweb]

A 25mm tyre on the rear, not much else you can do if there is such a small gap to the underside of the brake calliper.

 

[Cycleops]

How?

As the width of the blocks decrease the underside of the calliper raises slightly. You can check this on a side pull brake by removing the wheel, undoing the cable and squeezing the blocks together. As you squeeze you’ll see the underside of the bridge raising slightly. This is what I assume @DaveReading was meaning.
The increased clearance would be small.

 

[Sharky]

If you have a wheel/tyre from another bike, might be worth swapping to see if clearance is improved.

 

[fair weather cyclist]

If you have a wheel/tyre from another bike, might be worth swapping to see if clearance is improved.

Good shout

The wheel from my other bike currently has conti gp5000. But has a disc brake. Will it fit even just to see the clearance?

 

[Ajax Bay]

Probably not. The hub will be 135mm OLD (so not fit). Just put a 25 on the rear; and ride.
https://www.merlincycles.com/contin...ing&utm_campaign=phg-GB&ucpo=61283&source=PHG
Save the wider/deeper 28 for the front, when it's needed next year YMMV.
Though personally I've had bad experience with Giant tyres so would not fit. Last one on the rear I foolishly left on (after the front had failed (sidewall)) failed on me in the same way at about 680km into an end-to-end, short of Lancaster.

 

[Sharky]

The wheel from my other bike currently has conti gp5000. But has a disc brake. Will it fit even just to see the clearance?

You could perhaps just stand the bikes side by side and use a spirit level to span the tops of both wheels. If there is a significant difference, it might show up.
Good luck

I've got Conti Supersonics (20mm) on one of my bikes. I bet would have sufficient clearance

 

[vickster]

Good shout

The wheel from my other bike currently has conti gp5000. But has a disc brake. Will it fit even just to see the clearance?

Just change the tyre not the whole wheel?

 

[hatler]

If what the OP is asking is "Is there a dedicated adjustment in the brakes which enables me to raise the entire assembly away from the tyre?" then the answer is no. That's not an adjustment which is available. Reducing tyre diameter would be the easiest way out of this one.

 

[Brandane]

Let the air out of the tyre.
Surprised that I am first with this simple, obvious, and helpful solution.

 

[Sittingduck]

Just take the tyre off the other bike and put it on this wheel?! Hopefully the effort is worth satisfying your curiosity. Although, as said a few times just put narrower tyres on is the easiest fix.

 

[presta]

I'll try narrower tyres.

I just checked and the current giant tyres are 28mm and look bigger than the 28mm conti gp5000 I have on another bike. I'll get some 25mm continental and hope for the best.

Bear in mind that tyre width tolerance is ±3mm, so you could find that an oversize 25mm is bigger than an undersize 28mm. Here's the difference in size between a pair of my Marathons that are both nominally 35mm: