Failed Disc

[Marchrider]

That one looks set up oppositely badly to the one in the OP.
The pads should cover pretty much all of the braking service .

that looks like 10mm short, and that is a 160 disc - so it must be a 180 (which was the size of the one that failed)

 

[Regular.Cyclist]

even I wouldn't ride that…..

Neither would I. Aside for the risk of failure he’s going to put uneven wear on the pads which will cause him issues down the line unless he replaces those too with the new disk.

 

[wafter]

It needs spacers removing or a smaller adaptor plus spacers.

Often happens when adapting IS mount's to Post Mount brakes.

...or using the wrong size disc

 

[Marchrider]

Neither would I. Aside for the risk of failure he’s going to put uneven wear on the pads which will cause him issues down the line unless he replaces those too with the new disk.

think (hope) it will just be the commute tomorrow - and may be he will avoid the front brake - easy to do unless you have to race everyone else LOL

 

[fossyant]

Jesus.

 

[Yellow Saddle]

think (hope) it will just be the commute tomorrow - and may be he will avoid the front brake - easy to do unless you have to race everyone else LOL

As the great Mario once said: "If you brake, you don't win".

Hopefully he's going for the win tomorrow. We wish him luck in his racecommute. His bike is a wee bit lighter than last week, so he'll have an advantage.

 

[Alex321]

This and other recent threads make me relieved that I bought my bike before discs became mainstream.

Discs may well have their advantages but they seem to come with a whole world of mystique and complication that you just don't get with rim brakes. I just don't think I'd be clever enough for discs.

That is just not true unless you actually WANT to delve into all sorts of things.

If you are doing a LOT of miles, then you are going to have to replace discs every now and then. But we are talking 10's of thousands of miles normally.

And when you do, all you need to know is the diameter and whether they are centre lock or 6 bolt (most are centre lock).

Disc brakes for most of us need less maintenance and are more reliable than rim brakes.

 

[Alex321]

I guess I'll just have to take your word for that.

If I were buying a bike now I'd consider them, but from reading on here they do seem to be incredibly squealy and finicky, requiring special sanding and cleaning of discs, bleeding, extremely accurate alignment, subject to hard-to-diagnose problems and so on.

But I'm speaking from a position of ignorance, and as my frame isn't compatible with discs, it's likely to stay that way for the time being unless my bike gets broken or nicked or something.

99.99% of the time (at least), none of those things are true.

 

[Alex321]

first bit of the puzzle solved, it is 180 front, 160 rear
he had picked up a new 160 and you can see from the fit, its a bit short - been out on it and says its working fine, but will get a 180 sometime next week even I wouldn't ride that, it could do something unexpected and suddenly lock up

How long do discs typically last ? the one that failed was new last may (9 months) and was down to 1.1 - 1.3 thickness when it collapsed
he will do a big mileage (never counts so no idea mileage) and i'm sure he will race everyone on the commute, he's super fit super powerful, so probably a lot of hard braking, and i doubt there will be much in the way of maintenance or cleaning

They should last a lot linger than that, unless he is doing REALLY big mileage.

The ones on my bike have done 11,700 miles, and are showing little sign of wear. I have replaced the pads several times, both front and rear.

 

[hobo]

Send him round to mine please i'll sort his bike out.

 

[SpokeyDokey]

Disc problems seem to rear their heads on forums.

Discs working as the god of cycling intended, rarely warrant a post/thread.

3 MTB's and 1 road bike to date, all fitted with discs, and I have never suffered any squeal, and any initial post-purchase brake rub that I haven't managed to dial out.

As for maintenance, virtually zilch.

I do not miss the days of trying to toe-in & ensuring full block to rim contact of chunks of rubber.

Nor do I miss the worrisome lack of braking by rubber to rim on wet days.

Discs; brilliantly effective and with minimal maintenance.

Fugly? Not to my eyes. Tbh, bikes without disc brakes look pretty weird, imo.

 

[silva]

On fixed gear the brake maintenance is knotting shoe laces well.

 

[fossyant]

They should last a lot linger than that, unless he is doing REALLY big mileage.

The ones on my bike have done 11,700 miles, and are showing little sign of wear. I have replaced the pads several times, both front and rear.

It depends is the answer. If the disks and pads aren't cleaned often then they will wear and given the state of the bike in the photos I suspect the bike is just ridden and not maintained or cleaned.

I have worn out a set of pads in one ride in the Peak District (sandstone grit) so I carry a spare set of pads. I've yet to wear out a disk as I maintain my bike.

 

[Dogtrousers]

I do not miss the days of trying to toe-in & ensuring full block to rim contact of chunks of rubber.

Toeing-in is a weird ritual that's completely unnecessary. I used to do it but then decided I couldn't be arsed and the world didn't end. I just stick new blocks in when the old ones are done and fiddle briefly with the barrel adjuster.

 

[roubaixtuesday]

Toeing-in is a weird ritual that's completely unnecessary. I used to do it but then decided I couldn't be arsed and the world didn't end. I just stick new blocks in when the old ones are done and fiddle briefly with the barrel adjuster.

Indeed. I never understood it, given that as soon as your blocks are worn a tad, they're no longer toed in!

More generally, the absolute insistence that one type of brake is "better" regardless of the rather obvious pros and cons of them is remarkable.

Disc brakes are very low maintenance until they're not, at which point they're intractable to most amateurs, unlike rim brakes which are dead simple even to a cludger like me.

Cantis are the work of Beelzebub though.