rim strength

Coach said:

have different rims? wheels? different strength - eg a heavier rider
should look out for a particular make etc

Rim strength does vary, but most of the strength of a wheel comes from the
spoke tension. For good reliability, make sure the wheel has plenty of
spokes and good spokes. A light but decent-quality rim will be alright for
most uses, eg Mavic Open Pro. The 36 spoke option is particularly sensible
for heavy riders, or anyone who enjoys a peaceful mind. Wider tyres help
support extra weight as well (standard rims can take pretty wide tyres).

~PB

Pete Biggs said:

Coach said:

have different rims? wheels? different strength - eg a heavier rider
should look out for a particular make etc

Rim strength does vary, but most of the strength of a wheel comes from the
spoke tension.

Yes, but the rim has to be able to support that tension without
cracking. You should be able to build a tighter wheel with a better rim,
that will therefore support bigger loads without suffering from the
spokes going slack and therefore fatiguing.

Quoted message said:

For good reliability, make sure the wheel has plenty of spokes and
good spokes. A light but decent-quality rim will be alright for most
uses, eg Mavic Open Pro. The 36 spoke option is particularly sensible
for heavy riders, or anyone who enjoys a peaceful mind. Wider tyres
help support extra weight as well (standard rims can take pretty wide
tyres).

Whatever the width of the tyres, the same amount of weight is being
supported by the spokes surely?

In article <[email hidden]>

Ben C said:

Pete Biggs said:

Coach said:

have different rims? wheels? different strength - eg a heavier rider
should look out for a particular make etc

Rim strength does vary, but most of the strength of a wheel comes from the
spoke tension.

Yes, but the rim has to be able to support that tension without
cracking. You should be able to build a tighter wheel with a better rim,
that will therefore support bigger loads without suffering from the
spokes going slack and therefore fatiguing.

Agreed.

Quoted message said:

Quoted message said:

For good reliability, make sure the wheel has plenty of spokes and
good spokes. A light but decent-quality rim will be alright for most
uses, eg Mavic Open Pro. The 36 spoke option is particularly sensible
for heavy riders, or anyone who enjoys a peaceful mind. Wider tyres
help support extra weight as well (standard rims can take pretty wide
tyres).

Whatever the width of the tyres, the same amount of weight is being
supported by the spokes surely?

I think he means wider tyres provide a bit more cushioning.

Pete Biggs said:

Coach said:

have different rims? wheels? different strength - eg a heavier rider
should look out for a particular make etc

Rim strength does vary, but most of the strength of a wheel comes from the
spoke tension. For good reliability, make sure the wheel has plenty of
spokes and good spokes. A light but decent-quality rim will be alright for
most uses, eg Mavic Open Pro. The 36 spoke option is particularly sensible
for heavy riders, or anyone who enjoys a peaceful mind. Wider tyres help
support extra weight as well (standard rims can take pretty wide tyres).

~PB

Yep, I'd agree with that. Weinmann used to make an incredibly strong and
stiff rim that was concave on the inside surface. We made wheels with
them for customers who had wheel strength 'issues'. It was usually
disappointing.
In my opinion the best guide to strength lies in the way that the spoke
fits the hub. It should be a good close fit so that there isn't an
unsupported elbow.

--
Roger Thorpe

My email address is spamtrapped. You can work it out!

Ben C said:

Pete Biggs said:

Coach said:

have different rims? wheels? different strength - eg a heavier rider
should look out for a particular make etc

Rim strength does vary, but most of the strength of a wheel comes
from the spoke tension.

Yes, but the rim has to be able to support that tension without
cracking. You should be able to build a tighter wheel with a better
rim, that will therefore support bigger loads without suffering from
the spokes going slack and therefore fatiguing.

That's true, but the rim needn't be very heavy or substantial altogether to
tolerate good spoke tension. Maybe you could indeed build stronger wheels
with certain other rims, but a lot of seemingly-beefier rims can't really
take higher tension, especially ones with single eyelets.

There's also the theory that a stiffer rim directly affects the amount of
spoke slackening, but I don't think there's much to be gained in this regard
in practice from having a stiffer than average rim.

Quoted message said:

Quoted message said:

For good reliability, make sure the wheel has plenty of spokes and
good spokes. A light but decent-quality rim will be alright for most
uses, eg Mavic Open Pro. The 36 spoke option is particularly
sensible for heavy riders, or anyone who enjoys a peaceful mind.
Wider tyres
help support extra weight as well (standard rims can take pretty wide
tyres).

Whatever the width of the tyres, the same amount of weight is being
supported by the spokes surely?

I just mean a bigger tyre provides more suspension to better protect the
wheel, bike and rider in general.

~PB

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

Quoted message said:

have different rims? wheels? different strength - eg a heavier rider
should look out for a particular make etc
cheers

Wheels: Araya PX-645 rims built on Formula hubs
Wheels: Formula hubs with Alex Z-1000 rims
any good? which is best if any
thanks for the advice

nick

Roger Thorpe said:

Yep, I'd agree with that. Weinmann used to make an incredibly strong and
stiff rim that was concave on the inside surface.

AKA "Gentleman", I think.

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

Quoted message said:

Roger Thorpe said:

Yep, I'd agree with that. Weinmann used to make an incredibly strong and
stiff rim that was concave on the inside surface.

AKA "Gentleman", I think.

"Super Champion"? I think those were common on tandems. Are they the same?

cheers,
clive

Quoted message said:

Roger Thorpe said:

Yep, I'd agree with that. Weinmann used to make an incredibly strong and
stiff rim that was concave on the inside surface.

AKA "Gentleman", I think.

your memory must be better than mine. I seem to remember that they were
welded at the join. Can that be right?

--
Roger Thorpe

My email address is spamtrapped. You can work it out!

In article <[email hidden]>

Clive George said:

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

Quoted message said:

Roger Thorpe said:

Yep, I'd agree with that. Weinmann used to make an incredibly strong and
stiff rim that was concave on the inside surface.

AKA "Gentleman", I think.

"Super Champion"? I think those were common on tandems. Are they the same?

IIRC the Weinmann one was just called Concave, available in various
sizes (Dawes fitted them to the original Ranger mountain bike, Raleigh
used them on some tourers). The Gentleman and Super Champion Mod 58
were by Wolber. I had some Mod 58s and they were really good rims.

in message <[email hidden]>, Pete Biggs

(') said:

Coach said:

have different rims? wheels? different strength - eg a heavier rider
should look out for a particular make etc

Rim strength does vary, but most of the strength of a wheel comes from
the
spoke tension. For good reliability, make sure the wheel has plenty of
spokes and good spokes.

I really don't think this is necessary. A good quality wheel, yes, but...
Low spoke count wheels can be very strong. The wheel that I ran into a
many-ton lump of rock at 46mph last year is still true to within 1mm side
to side and less than that in runout, despite having only 18 spokes.

Yes, a good well built traditional wheel with 32 or 36 spokes is very
strong, but so is a good modern wheel with half that number.

--
[email hidden] (Simon Brooke) http://www.jasmine.org.uk/~simon/
.::;===r==\
/ /___||___\____
//==\- ||- | /__\( MS Windows IS an operating environment.
//____\__||___|_// \|: C++ IS an object oriented programming language.
\__/ ~~~~~~~~~ \__/ Citroen 2cv6 IS a four door family saloon.