brakes for 28mm tires?

Joerg wrote:
On 2016-05-11 13:08, Lou Holtman wrote:
Frank Krygowski wrote:
On 5/11/2016 3:29 PM, Lou Holtman wrote:
Frank Krygowski wrote:
My friend is still shopping for a bike. One sticking point: Seems like
most low- to mid-range road bikes come with dual pivot brakes (usually
Tektro, some Shimano) that won't open wide enough to clear an inflated
28mm tire. In local shops, I'm not seeing road bikes with V-brakes
(nor, of course, cantilevers). Not interested in discs.

Since she'll be doing a lot of riding on fairly bumpy roads or on
crushed limestone rail-trails, I think 28s are what she needs.

It seems a shame. From what I can tell, just a minor change to the
brake quick-release cam would allow them to open quite a bit farther.
And if there were a way to put two quick release devices in series, it
seems that could give more open clearance. But I don't see that's
possible with these dual-pivot sidepulls.

Any tips or ideas?



You could use the thingies Rohloff uses to make the Rohloff hubbed wheel
removable

https://www.bike-components.de/de/Ro...nzuege-p18571/

I give up. How does that work?


It will look ugle but aesthetics isn't your strongest point anyway :-)

Oh, I disagree! I think my aesthetic taste is excellent! (I know it's
a common attitude, but in my case, it's correct!)



You cut the cable put one half at one end and the other half on the other
end of the cable. You click them together and twist to open.



Not sure if I'd trust those for the full force exerted when hitting the
brakes hard. These are meant for shifter cables.


I think you are right.

Regular caliper brakes with release levers usually open wide enough for
28mm tires unless set to a super-tight rim clearance or unless the rim
is a bit narrow.

I run 28 mm without problems also. Don't see the problem either.






--
Lou

On 12/05/16 02:46, jbeattie wrote:
On Tuesday, May 10, 2016 at 3:49:04 PM UTC-7, Frank Krygowski wrote:
My friend is still shopping for a bike. One sticking point: Seems
like most low- to mid-range road bikes come with dual pivot brakes
(usually Tektro, some Shimano) that won't open wide enough to clear
an inflated 28mm tire. In local shops, I'm not seeing road bikes
with V-brakes (nor, of course, cantilevers). Not interested in
discs.

Since she'll be doing a lot of riding on fairly bumpy roads or on
crushed limestone rail-trails, I think 28s are what she needs.

It seems a shame. From what I can tell, just a minor change to
the brake quick-release cam would allow them to open quite a bit
farther. And if there were a way to put two quick release devices
in series, it seems that could give more open clearance. But I
don't see that's possible with these dual-pivot sidepulls.

Any tips or ideas?


Sometimes just shifting to a thinner brake pad will do the trick --
along with all the other suggestions (in-line adjusters, etc.)
Another benefit of discs is that you can use big tires and fenders
and not just one or the other.


I don't see how, once the brake is adjusted to the same clearance from
the rim for normal brake performance.

--
JS

On Wednesday, May 11, 2016 at 4:07:14 PM UTC-7, James wrote:
On 12/05/16 02:46, jbeattie wrote:
On Tuesday, May 10, 2016 at 3:49:04 PM UTC-7, Frank Krygowski wrote:
My friend is still shopping for a bike. One sticking point: Seems
like most low- to mid-range road bikes come with dual pivot brakes
(usually Tektro, some Shimano) that won't open wide enough to clear
an inflated 28mm tire. In local shops, I'm not seeing road bikes
with V-brakes (nor, of course, cantilevers). Not interested in
discs.

Since she'll be doing a lot of riding on fairly bumpy roads or on
crushed limestone rail-trails, I think 28s are what she needs.

It seems a shame. From what I can tell, just a minor change to
the brake quick-release cam would allow them to open quite a bit
farther. And if there were a way to put two quick release devices
in series, it seems that could give more open clearance. But I
don't see that's possible with these dual-pivot sidepulls.

Any tips or ideas?


Sometimes just shifting to a thinner brake pad will do the trick --
along with all the other suggestions (in-line adjusters, etc.)
Another benefit of discs is that you can use big tires and fenders
and not just one or the other.


I don't see how, once the brake is adjusted to the same clearance from
the rim for normal brake performance.


You pop the QR and twirl the barrel adjuster in on a Shimano brake. It's the equivalent of the in-line adjuster fix. More process, but you can get the tire out. If your brake blocks are too fat, though, the back of the block hits the forks or stays, and there still isn't enough room to get the tire out.

-- Jay Beattie.

On Wednesday, May 11, 2016 at 1:20:58 PM UTC-7, Joerg wrote:
On 2016-05-11 13:08, Lou Holtman wrote:
Frank Krygowski wrote:
On 5/11/2016 3:29 PM, Lou Holtman wrote:
Frank Krygowski wrote:
My friend is still shopping for a bike. One sticking point: Seems like
most low- to mid-range road bikes come with dual pivot brakes (usually
Tektro, some Shimano) that won't open wide enough to clear an inflated
28mm tire. In local shops, I'm not seeing road bikes with V-brakes
(nor, of course, cantilevers). Not interested in discs.

Since she'll be doing a lot of riding on fairly bumpy roads or on
crushed limestone rail-trails, I think 28s are what she needs.

It seems a shame. From what I can tell, just a minor change to the
brake quick-release cam would allow them to open quite a bit farther.
And if there were a way to put two quick release devices in series, it
seems that could give more open clearance. But I don't see that's
possible with these dual-pivot sidepulls.

Any tips or ideas?



You could use the thingies Rohloff uses to make the Rohloff hubbed wheel
removable

https://www.bike-components.de/de/Ro...nzuege-p18571/

I give up. How does that work?


It will look ugle but aesthetics isn't your strongest point anyway :-)

Oh, I disagree! I think my aesthetic taste is excellent! (I know it's
a common attitude, but in my case, it's correct!)



You cut the cable put one half at one end and the other half on the other
end of the cable. You click them together and twist to open.



Not sure if I'd trust those for the full force exerted when hitting the
brakes hard. These are meant for shifter cables.

Regular caliper brakes with release levers usually open wide enough for
28mm tires unless set to a super-tight rim clearance or unless the rim
is a bit narrow.


Here is the S&S option -- http://www.sandsmachine.com/ac_cable.htm I agree that it should be simpler than splitting a cable.

-- Jay Beattie.

On 5/11/2016 4:12 PM, Lou Holtman wrote:
Frank Krygowski wrote:
On 5/11/2016 3:29 PM, Lou Holtman wrote:
Frank Krygowski wrote:
My friend is still shopping for a bike. One sticking point: Seems like
most low- to mid-range road bikes come with dual pivot brakes (usually
Tektro, some Shimano) that won't open wide enough to clear an inflated
28mm tire. In local shops, I'm not seeing road bikes with V-brakes
(nor, of course, cantilevers). Not interested in discs.

Since she'll be doing a lot of riding on fairly bumpy roads or on
crushed limestone rail-trails, I think 28s are what she needs.

It seems a shame. From what I can tell, just a minor change to the
brake quick-release cam would allow them to open quite a bit farther.
And if there were a way to put two quick release devices in series, it
seems that could give more open clearance. But I don't see that's
possible with these dual-pivot sidepulls.

Any tips or ideas?



You could use the thingies Rohloff uses to make the Rohloff hubbed wheel
removable

https://www.bike-components.de/de/Ro...nzuege-p18571/

I give up. How does that work?


It will look ugle but aesthetics isn't your strongest point anyway :-)

Oh, I disagree! I think my aesthetic taste is excellent! (I know it's
a common attitude, but in my case, it's correct!)



This is the other end


https://www.bike-components.de/de/Ro...nzuege-p18570/

Ah. That makes more sense now.


--
- Frank Krygowski

On 11-05-16 00:49, Frank Krygowski wrote:
My friend is still shopping for a bike. One sticking point: Seems like
most low- to mid-range road bikes come with dual pivot brakes (usually
Tektro, some Shimano) that won't open wide enough to clear an inflated
28mm tire. In local shops, I'm not seeing road bikes with V-brakes
(nor, of course, cantilevers). Not interested in discs.

Since she'll be doing a lot of riding on fairly bumpy roads or on
crushed limestone rail-trails, I think 28s are what she needs.

It seems a shame. From what I can tell, just a minor change to the
brake quick-release cam would allow them to open quite a bit farther.
And if there were a way to put two quick release devices in series, it
seems that could give more open clearance. But I don't see that's
possible with these dual-pivot sidepulls.

Any tips or ideas?


Besides all the other things suggested, after fixing a flat maybe just
pump up the tire only after the wheel is back in the frame?

Ned

On 5/12/2016 7:01 AM, Ned Mantei wrote:
On 11-05-16 00:49, Frank Krygowski wrote:
My friend is still shopping for a bike. One sticking point: Seems like
most low- to mid-range road bikes come with dual pivot brakes (usually
Tektro, some Shimano) that won't open wide enough to clear an inflated
28mm tire. In local shops, I'm not seeing road bikes with V-brakes
(nor, of course, cantilevers). Not interested in discs.

Since she'll be doing a lot of riding on fairly bumpy roads or on
crushed limestone rail-trails, I think 28s are what she needs.

It seems a shame. From what I can tell, just a minor change to the
brake quick-release cam would allow them to open quite a bit farther.
And if there were a way to put two quick release devices in series, it
seems that could give more open clearance. But I don't see that's
possible with these dual-pivot sidepulls.

Any tips or ideas?


Besides all the other things suggested, after fixing a flat maybe just
pump up the tire only after the wheel is back in the frame?

That works for flats, but it doesn't work nearly as well for taking the
front wheel off to transport the bike in a car.

But as I said before, it was one bike shop owner who claimed the brakes
on the bike he was trying to sell would not open far enough to clear a
28mm tire. Perhaps he was mistaken. When we're finally in a bike shop
together, I suppose my friend and I can check by just trading wheels
between bikes.

--
- Frank Krygowski

On 12-05-16 15:23, Frank Krygowski wrote:
On 5/12/2016 7:01 AM, Ned Mantei wrote:
On 11-05-16 00:49, Frank Krygowski wrote:
My friend is still shopping for a bike. One sticking point: Seems like
most low- to mid-range road bikes come with dual pivot brakes (usually
Tektro, some Shimano) that won't open wide enough to clear an inflated
28mm tire. In local shops, I'm not seeing road bikes with V-brakes
(nor, of course, cantilevers). Not interested in discs.

Since she'll be doing a lot of riding on fairly bumpy roads or on
crushed limestone rail-trails, I think 28s are what she needs.

It seems a shame. From what I can tell, just a minor change to the
brake quick-release cam would allow them to open quite a bit farther.
And if there were a way to put two quick release devices in series, it
seems that could give more open clearance. But I don't see that's
possible with these dual-pivot sidepulls.

Any tips or ideas?


Besides all the other things suggested, after fixing a flat maybe just
pump up the tire only after the wheel is back in the frame?

That works for flats, but it doesn't work nearly as well for taking the
front wheel off to transport the bike in a car.


Now I get it--I hadn't thought of that aspect. Here in Switzerland I
always take my bike with me on the train for tours not starting at home.

Ned
(not a car owner, but do have one-year rail passes for me and for my bike)