Marathon + in larger sizes

Nick Austin said the following on 06/12/2007 14:59:

Quoted message said:

I would like to upgrade to Schwalbe Marathon Plus but I cannot
find an online supplier to fit my current wheels. I'm currently
on 700 x 42c (44-622) but the largest I can find is 700 x 37.
Do I need new wheels?

No. The 700c is the size of the wheel regardless of tyre size, sort of.
The rim diameter (is it the tyre seating area?) is 622mm, whether the
tyre is 15mm or 42mm. Frankly, 42mm is a balloon tyre on a 700c wheel,
unless you're talking about a 29er (and if you don't know what that is,
you're not!!) I've just taken what are nominally 38mm tyre off mine,
although they actually measured 40mm, because they were just too big.

Personally, I would just go with the 37mm. Ref my earlier thread, be
prepared for a battle to fit them, although that will depend on your rims.

--
Paul Boyd
http://www.paul-boyd.co.uk/

On 6 Dec, 14:59, Nick Austin <[email hidden]>

Quoted message said:

I would like to upgrade to Schwalbe Marathon Plus but I cannot
find an online supplier to fit my current wheels. I'm currently
on 700 x 42c (44-622) but the largest I can find is 700 x 37.
Do I need new wheels?

Nick.

They only go up to 40 in a MTB version, 38 in the road version
http://www.schwalbe.co.uk/c2-1071-marathon-plus.html

A quick search shows ChainReaction claim they'll get some in 3-5 days,
believe that if you will

I'd think 38s or 40s would be OK, what wheels have you got?

Paul Boyd said:

Nick Austin said the following on 06/12/2007 14:59:

Quoted message said:

I would like to upgrade to Schwalbe Marathon Plus but I cannot
find an online supplier to fit my current wheels. I'm currently
on 700 x 42c (44-622) but the largest I can find is 700 x 37.
Do I need new wheels?

No. The 700c is the size of the wheel regardless of tyre size, sort
of. The rim diameter (is it the tyre seating area?) is 622mm,
whether the tyre is 15mm or 42mm.

"700" or "700C" nowdays is a code for the diameter and means the same thing
as 622. 700C rims come in various widths.

In theory it's possible that Nick's wheel rims are too wide for 37mm tyres,
but that's very unlikley. I don't know of such a monster anyway. Probably
35mm will be OK too and are fat enough for anyone cycling on any road or
cycle/foot path, in my opinion.

~PB

On Thu, 6 Dec 2007 07:11:48 -0800 (PST), POHB <[email hidden]>

Quoted message said:

I'd think 38s or 40s would be OK, what wheels have you got?

Thanks. Not sure what I have but they are covered in writing.

Tyres say "Specialized Borough CX" with a sticker on the sidewall
saying "60 tpi / wire bead" and "all weather performance compound."

Rims say "Specialized Alexrims Globe double wall 622 x 18"
and 6061-T6 700.

Nick.

In article said:

I would like to upgrade to Schwalbe Marathon Plus but I cannot
find an online supplier to fit my current wheels. I'm currently
on 700 x 42c (44-622) but the largest I can find is 700 x 37.
Do I need new wheels?

Have a look at http://www.sheldonbrown.com/tire-sizing.html#width
If your 44 tyres are at the lower limit of what your rim width
will take, then you need new rims, but that's unlikely on a road
bike (in the general sense of "not off-road specific bike"😉.

Nick Austin said:

Rims say "Specialized Alexrims Globe double wall 622 x 18"
and 6061-T6 700.

You could fit 28mm tyres on them if you wanted. I suggest 32 to 37mm. (I'm
guessing it's a city or hybrid bike).

From http://www.sheldonbrown.com/tyre-sizing.html :

"Although you can use practically any tire/rim combination that shares
the same bead seat diameter, it is unwise to use widely disparate sizes.
"If you use a very narrow tyre on a wide rim, you risk pinch flats and
rim damage from road hazards.

"If you use a very wide tyre on a narrow rim, you risk sidewall or rim
failure. This combination causes very sloppy handling at low speeds.
Unfortunately, current mountain-bike fashion pushes the edge of this. In the
interest of weight saving, most current mountain bikes have excessively
narrow rims. Such narrow rims work very poorly with wide tires, unless the
tires are overinflated...but that defeats the purpose of wide tires, and
puts undue stress on the rim sidewalls"

~PB

Nick Austin said:

On Thu, 6 Dec 2007 07:11:48 -0800 (PST), POHB <[email hidden]>

Quoted message said:

I'd think 38s or 40s would be OK, what wheels have you got?

Thanks. Not sure what I have but they are covered in writing.

Tyres say "Specialized Borough CX" with a sticker on the sidewall
saying "60 tpi / wire bead" and "all weather performance compound."

Rims say "Specialized Alexrims Globe double wall 622 x 18"
and 6061-T6 700.

Head over to Sheldon Brown's site and you'll have all the cryptic numbers
explained :-)
http://sheldonbrown.com/tire-sizing.html

The first bit (622 x 18) is the rim size, the second bit looks like the
aluminium alloy specification.

You should be fine with anything bigger than 30mm cross section on a 622
(aka 700c) rim. That means just about anything aimed at "touring" rather
than "racing" or "audax".

If you think your existing bike is a bit slow and podgy, go smaller (say
32mm to 35mm). If its "OK" to ride then a few mm less than your current
won't be massively different to the tyres you already have.

( and if you have a cycle computer, it will need recalibrating if you change
the tyre size ).

- Nigel

--
Nigel Cliffe,
Webmaster at http://www.2mm.org.uk/

Nigel Cliffe said:

You should be fine with anything bigger than 30mm cross section on a
622 (aka 700c) rim. That means just about anything aimed at "touring"
rather than "racing" or "audax".

A 28mm tyre is fine with my Mavic 622 x 18 rim, though of course fatter
tyres have certain advantages.

Most road racing rims are also 622, by the way, but are narrower than 18mm.

~PB

Pete Biggs said:

Nigel Cliffe said:

You should be fine with anything bigger than 30mm cross section on a
622 (aka 700c) rim. That means just about anything aimed at "touring"
rather than "racing" or "audax".

A 28mm tyre is fine with my Mavic 622 x 18 rim, though of course
fatter tyres have certain advantages.

Most road racing rims are also 622, by the way, but are narrower than
18mm.

Fair point on minimum size on an 18 section rim. I guessed 30 as sensible
minimum, but if 28 works, that's another option.

My wording was less than clear, I meant "on a 622 x 18". As you say, other
narrower 622 rims exist which are better suited to narrower racing tyre
sections.

- Nigel

--
Nigel Cliffe,
Webmaster at http://www.2mm.org.uk/

Pete Biggs said:

Nick Austin said:

Rims say "Specialized Alexrims Globe double wall 622 x 18"
and 6061-T6 700.

You could fit 28mm tyres on them if you wanted. I suggest 32 to 37mm. (I'm
guessing it's a city or hybrid bike).

From http://www.sheldonbrown.com/tyre-sizing.html :

OK that explains things a bit. I thought that rims and tyres were
like matched pairs and that all the numbers had to be the same for
a correct fit. Now I know a bit better.

I'm not sure I believe that the inner rim width is 18mm. I tried
to measure it but it's a bit difficult without removing the tyre
and tube. The outer rim width is about 25mm. Can the rims really
be 3.5mm thick?

On sheldon it says that "A general guideline is that the tire
width should be between 1.45/2.0 x the inner rim width."

If my inner rim width really is is 18mm then surely the tyre
width ought to be between 26 and 36. That would mean that the
current tyres (42mm) are too big although I haven't noticed
any problems.

Nick.

Nick Austin said:

I'm not sure I believe that the inner rim width is 18mm. I tried
to measure it but it's a bit difficult without removing the tyre
and tube. The outer rim width is about 25mm. Can the rims really
be 3.5mm thick?

Yes when the hooks are included. See the diagram here:
http://www.sheldonbrown.com/rim-sizing.html

Quoted message said:

On sheldon it says that "A general guideline is that the tire
width should be between 1.45/2.0 x the inner rim width."

If my inner rim width really is is 18mm then surely the tyre
width ought to be between 26 and 36. That would mean that the
current tyres (42mm) are too big although I haven't noticed
any problems.

Bike manufacturers are not always sensible. You wouldn't necessarily get
problems, though, just a greater risk of problems, especially if the tyres
were pumped up extremely hard.

~PB

Quoted message said:

Quoted message said:

On sheldon it says that "A general guideline is that the tire
width should be between 1.45/2.0 x the inner rim width."

If my inner rim width really is is 18mm then surely the tyre
width ought to be between 26 and 36. That would mean that the
current tyres (42mm) are too big although I haven't noticed
any problems.

Bike manufacturers are not always sensible. You wouldn't necessarily
get problems, though, just a greater risk of problems, especially if
the tyres were pumped up extremely hard.

Or not hard enough. (See Sheldon's article).

~PB

"Nick Austin" <[email hidden]> wrote in message
news:[email hidden]...

Quoted message said:

I would like to upgrade to Schwalbe Marathon Plus but I cannot
find an online supplier to fit my current wheels. I'm currently
on 700 x 42c (44-622) but the largest I can find is 700 x 37.
Do I need new wheels?

Nick.

I have a hybrid with 700C 37 Marthons (not plus) and they are very large.
Comfortable, but very large. I wouldn't personally go any bigger.

Jc

in message <[email hidden]>, Nick Austin

(') said:

I would like to upgrade to Schwalbe Marathon Plus but I cannot
find an online supplier to fit my current wheels. I'm currently
on 700 x 42c (44-622) but the largest I can find is 700 x 37.
Do I need new wheels?

No. 622 is the bead seat diameter, it's the same. You can fit any 700xNNc
tyre, from 700x19c upwards.

--
[email hidden] (Simon Brooke) http://www.jasmine.org.uk/~simon/
Windows 95:
You, you, you! You make a grown man cry...
M. Jagger/K. Richards

In article said:

in message <[email hidden]>, Nick Austin

(') said:

I would like to upgrade to Schwalbe Marathon Plus but I cannot
find an online supplier to fit my current wheels. I'm currently
on 700 x 42c (44-622) but the largest I can find is 700 x 37.
Do I need new wheels?

No. 622 is the bead seat diameter, it's the same. You can fit any 700xNNc
tyre, from 700x19c upwards.

What width rim do you think will take both a 19 and a 42?
http://www.sheldonbrown.com/tire-sizing.html#width

Simon Brooke said:

in message <[email hidden]>, Nick Austin

(') said:

I would like to upgrade to Schwalbe Marathon Plus but I cannot
find an online supplier to fit my current wheels. I'm currently
on 700 x 42c (44-622) but the largest I can find is 700 x 37.
Do I need new wheels?

No. 622 is the bead seat diameter, it's the same. You can fit any
700xNNc tyre, from 700x19c upwards.

The rim has an *internal* width of 18mm. A 19mm tyre would be terrible on
it.

~PB

Quoted message said:

Quoted message said:

No. 622 is the bead seat diameter, it's the same. You can fit any 700xNNc
tyre, from 700x19c upwards.

What width rim do you think will take both a 19 and a 42?
http://www.sheldonbrown.com/tire-sizing.html#width

Tho that table is rather conservative - in my experience you can go a
further size up and down without problems.

In article said:

Quoted message said:

Quoted message said:

No. 622 is the bead seat diameter, it's the same. You can fit any 700xNNc
tyre, from 700x19c upwards.

What width rim do you think will take both a 19 and a 42?
http://www.sheldonbrown.com/tire-sizing.html#width

Tho that table is rather conservative - in my experience you can go a
further size up and down without problems.

Yes, but from 19 to 42 means more than one further size up or down at
at least one end.