Can I replace 37-622 tires with 28-622?

[Jdsk]

What is the plural of Mary?

Marys.

As in Mickey Mouses. And this actually has to be addressed in theme park rostering!

There's a good explanation of these plurals of proper nouns in Pinker:
https://en.wikipedia.org/wiki/The_Sense_of_Style

Jonathan

[531colin]

Mick also has a parrot.

I just wish he would keep the parrot away from the keyboard

Yes, I know what the cardboard label says.
I'm willing to bet that that tyre in the picture from Cordo will say 622.

OP said his TYRE said 28" and that it was an old bike.

OP said the tyre was marked 37-622, as well as some gibberish.....its the first post on the first page.
Therefore its a "700c" tyre, its NOT a 28 x 1 1/2 " tyre like your sister had on a bike which was already old half a century ago.
28 x 1 5/8 x 1 1/2 is a "northern european designation for 622.....Sheldon....https://sheldonbrown.com/tire-sizing.html#fraction

[fausto99]

622 is 622. That’s all there is to it. Full stop.

There’s rarely a need for any discussion or wondering about compatibility. IME it’s very rare to have issues due to rim and tyre widths.

[Vorpal]

OP said the tyre was marked 37-622.....its the first post on the first page.

It wasn't completely clear to me if the 37-622 in parentheses was marked on the tyre, or the OPs translation of what was marked on the tyre.

[Mick F]

Yes, unclear, hence my question and banging on about it.

The OP.

Hello everybody,

This is a very urgent matter for me, so I appreciate anyone taking the time to read this. I have an older road bike which needs a tire change. On the current tires the markings are 28 x 1 5/8 x 1 3/8 .........................

I took it to mean they were different widths front/rear, but it was the 28 marking ON THE TIRES that I am commenting on.

[Jdsk]

Yes, unclear, hence my question and banging on about it.

The OP.

Hello everybody,

This is a very urgent matter for me, so I appreciate anyone taking the time to read this. I have an older road bike which needs a tire change. On the current tires the markings are 28 x 1 5/8 x 1 3/8 .........................

I took it to mean they were different widths front/rear, but it was the 28 marking ON THE TIRES that I am commenting on.

That truncates the quote about the tyre size, which was:

On the current tires the markings are 28 x 1 5/8 x 1 3/8 (37-622).

My emboldening.
From that point onwards there was never was any doubt about the diameter. And the Subject of the thread is perfectly worded.

And the repeated reintroduction of historic units to the discussion has got in the way of the original question.

Jonathan

[MsMellie]

MsMellie - When you measure your rim width, it's more relevant to measure internal as opposed to external width, like this:



Optimum tyre width is 1.8 times the internal rim width, with anywhere between 1.4 and 2.2 times still being ok. There can be a lot more leeway than that, though, before the rim/tyre widths become unsafe, as you'll see from the chart below.

If your wheels came with 37c (37mm) tyres (they're probably a little under that - most tyres are purposely undersize - it's less problematic than oversize), your internal rim width is probably somewhere around 17mm or 19mm or thereabouts. Either would let you fit 28mm tyres, but narrower than 17mm might still be ok:

Thank you for the material I had measured my internal rim width today and it is 20,3 mm (Used a precise measuring tool and double-checked). If I understand the chart you provided well, it should fit a 28? A WTB chart found here: https://www.wtb.com/pages/tire-rim-fit-chart says the same thing. Any thoughts?

[Jdsk]

The Schwalbe compatibility table (to add to the collection!):
https://www.schwalbe.com/files/schwalbe ... nen_EN.pdf

Jonathan

[iandusud]

Yes, unclear, hence my question and banging on about it.

The OP.

Hello everybody,

This is a very urgent matter for me, so I appreciate anyone taking the time to read this. I have an older road bike which needs a tire change. On the current tires the markings are 28 x 1 5/8 x 1 3/8 .........................

I took it to mean they were different widths front/rear, but it was the 28 marking ON THE TIRES that I am commenting on.

That truncates the quote about the tyre size, which was:

On the current tires the markings are 28 x 1 5/8 x 1 3/8 (37-622).

My emboldening.
From that point onwards there was never was any doubt about the diameter. And the Subject of the thread is perfectly worded.

And the repeated reintroduction of historic units to the discussion has got in the way of the original question.

Jonathan

Imperial tyre sizes are based on the external diameter of the tyre, hence a 26 x 1 1/4 tyre requires a bigger diameter rim than a 26 x 1 3/8 tyre even though they both have a 26" diameter. What creates a lot of confusion is when tyre manufacturers start making narrow versions of a given tyre such a 27 x 1 designed to fit a rim for a 27 x 1 1/4. With regard to the 28" tyre in question I suspect that this particular tyre size started life as a 28" x 1 3/4". If you do the maths and add 2 x 1 3/4" (which equals 89mm) and add 622 you get 711mm. If you then divide by 25.4 to convert to inches you get 28! So my hunch is that the 700C tyre actually started life as a 28 x 1 3/4 and got narrower (probably as roads improved).

[kylecycler]

Thank you for the material I had measured my internal rim width today and it is 20,3 mm (Used a precise measuring tool and double-checked). If I understand the chart you provided well, it should fit a 28? A WTB chart found here: https://www.wtb.com/pages/tire-rim-fit-chart says the same thing. Any thoughts?

It looks like it's ok but not ideal. You should be fine, though. I'm not an expert, mind you, I was just trying to help!

What I left out yesterday is that it's become the norm recently for aero wheel rims - like, deep dish carbon wheels - to have the same outer rim width as the tyre, for low drag, so you can get 28mm tyres fitted to 23mm internal diameter rims, for example, which isn't recommended on the chart - I believe there's a risk that if the rim is too wide for the tyre, the tyre could come off the rim in the event of a blowout but I haven't heard of it happening.

The WTB chart, btw, confirms what I found with my 19mm rims - they're quite happy with 50mm tyres but I tried 55mm tyres and they got squiggly when running them at low pressures, although they were ok otherwise. You'll be running higher pressures with 28mm tyres so that shouldn't be an issue.

[Mick F]

.......hence a 26 x 1 1/4 tyre requires a bigger diameter rim than a 26 x 1 3/8 tyre

No they don't.

............ or they didn't when I was on 26" rims in the 60s and 70s.
Had both those widths of tyres on the same bike over the years.

[kylecycler]

The Schwalbe compatibility table (to add to the collection!):
https://www.schwalbe.com/files/schwalbe ... nen_EN.pdf

Jonathan

That's a good one too, Jonathan - I've got a folder in my Documents labelled 'Charts'!

[andrew_s]

.......hence a 26 x 1 1/4 tyre requires a bigger diameter rim than a 26 x 1 3/8 tyre

No they don't.

............ or they didn't when I was on 26" rims in the 60s and 70s.
Had both those widths of tyres on the same bike over the years.

That's because, old as you are, you post-date the time by which manufacturers had started making tyres for rims other than the native size.
At least one of tyres would have been marked with an extra width to indicate the rim size, such as 26 x 1 3/8 x 1 1/4, and you've forgotten the actual marking and only remembered the width.

It really is about time you caught up with the modern world and learned to use the metric system. It makes things so much simpler.

[Mick F]

My memories are correct,
Same rims would take 1 3/8 and 1 1/4 tyres.

This day and age are different of course, but the OP said it was an "older road bike" and said 28 was marked on the tyre.
Mine said 26 in those days, and later I had a different bike and they said 27 on them.
That's the TYRES ................ not the tubes or the cardboard labels on either of them.

These days, things are completely different, but I am talking of an "older road bike" and putting my point across.

[fastpedaller]

It really is about time you caught up with the modern world and learned to use the metric system. It makes things so much simpler.

Couldn't agree more. If only bike shops etc would also use the ETRTO system. If you ask why they don't the answer is "it confuses customers"
Beggars belief. The one that grates with me is "29ers " If ever there was a more blatant attempt at dressing up something as 'special' that is it! Presumably saying it's a large width/rolling radius tyre to fit a 700 rim would be giving the game away?