Brake Pad Touching Tyre

[C R]

When restoring some old 80s era bikes some years ago I did actually take some centre pulls apart. I cleaned polished them up nicely. It wasn't all that difficult to take them apart.

However, putting them back together. Now, that was a different matter. Spring goes boing! Spring goes ping!

Yep, the taking apart is normally easier than the putting back together.

 

[geocycle]

I noticed that my Spa audax came with 105 kit but tektro brakes. That’s probably because of this issue and how Spa worked around it.

 

[Jimmy Welch]

I noticed that my Spa audax came with 105 kit but tektro brakes. That’s probably because of this issue and how Spa worked around it.

Yeah that'll be the reason , I went riding today 1st time since I extended the caliper with a file and I noticed the little rubber nodules on the tyre that come on new tyres are still intact after 50 plus mile so I assume I've solved it

 

[Dogtrousers]

Yeah that'll be the reason , I went riding today 1st time since I extended the caliper with a file and I noticed the little rubber nodules on the tyre that come on new tyres are still intact after 50 plus mile so I assume I've solved it

Just be sure to keep an eye on it as the brake pads wear down.

 

[richardfm]

I have done this, it does work but remember not to take too much off.

How much is "too much"?

 

[Paulus]

How much is "too much"?

Enough to get the blocks lining up, but not too much so the bottom of the caliper is thin, or you go right through it.

 

[richardfm]

Enough to get the blocks lining up, but not too much so the bottom of the caliper is thin, or you go right through it.

How much is "thin"?

 

[Jimmy Welch]

How much is "thin"?

I've left and a centimeter of metal

 

[Ajax Bay]

I've left a centimeter of metal

I'm very surprised.

 

[Jimmy Welch]

I'm very surprised.
View attachment 740830

Sorry yeah your right 2mm it's about 1cm to start with

 

[Jimmy Welch]

I'm very surprised.
View attachment 740830

Sorry your right about 2mm left its about 1cm to start

 

[C R]

Sorry yeah your right 2mm it's about 1cm to start with

Are you sure it had ten mm originally? The ones I have seen have maybe 5mm tops. Ten mm would be a rather extravagant use of material for no good purpose.

 

[Jimmy Welch]

Are you sure it had ten mm originally? The ones I have seen have maybe 5mm tops. Ten mm would be a rather extravagant use of material for no good purpose.

Yeah it's ever so slightly tear dropped at the bottom , it's probably nearer 5 than ten I've left 2mm on the bottom now and the fit is bang on with worn pads so hopefully with a set of new ones I should be well in , now I've just got to get over the little voice in my head every time I slam on , the little manufacturer nodules on the tire are still there and the tiny dots of Tipex I painted on likewise so the rim is clear

 

[T4tomo]

So it seems from brief googling that 5700 and 5800 have different brake pull ratios, but I do not know which way around. You will either have a very short lever pull meaning sharp brakes or you will have a long lever pull meaning lots of travel with the risk of bottoming the lever on the bars.

I'd double check that, they have different gear pull ratio,, not least because once is 10 speed one in 11 speed, but the brake pull is identical.

 

[Ajax Bay]

I'd double check that, they [ST-5700 and ST-5800] have different gear pull ratio,, not least because once is 10 speed one in 11 speed, but the brake pull is identical.

Yes, I think @figbat misreads.
https://productinfo.shimano.com/pdfs/product/archive/2021-2022_Compatibility_v032_en.pdf and go to Page 23