Knobbies

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

Quoted message said:

So i just got me a set of Schwable BlackJack tires 2.25" .. the biggest i can fit on my frame..
but a weee problem (maybe) exists.

ive managed to center the tires, which was a pain .. especially on my Ritchey Rock 415E rims which
ive heard are normally a [censored] to center tires with. And i have 1 millimeter clearance between the
chainstays and rear tire. So when i go into a turn, and the wheel bends, i get a little bit of
rubbing action on the chainstays.

So, my question is ... is this damaging to my polished aluminum frame/chainstays??

Eventually, yes. Short-term, no. Your tires have grit and [censored] on them and will eventually wear down
the aluminum. How long will that take? Dunno. I've seen a tire burn through the paint in about 100'.
But that's a whole different thing. If you're dead set on those tires, I'd ride a bit and see after
a week or two how much of a groove has been cut in the aluminum, if at all. If you go a whole season
and only have a barely perceptible groove, I'd say you'll probably be fine for quite some time.
Personally, I find it technically bush to have the tire rub the frame and I wouldn't do it! But I'm
a perfectionist sometimes...

Cheers,

Scott..

On Thu, 26 Feb 2004 22:10:40 +0100, PsyCro <[email hidden]>

Quoted message said:

So i just got me a set of Schwable BlackJack tires 2.25" .. the biggest i can fit on my frame.. but
a weee problem (maybe) exists.

ive managed to center the tires, which was a pain .. especially on my Ritchey Rock 415E rims which
ive heard are normally a [censored] to center

Read up on wheel truing. Lubricating the spoke threads helps.

Quoted message said:

tires with. And i have 1 millimeter clearance between the chainstays and rear tire. So when i go
into a turn, and the wheel bends, i get a little bit of rubbing action on the chainstays.

I suspect the wheel itself isn't bending, but maybe the frame. If the wheel is bending, you may not
have enough tension in the spokes. Also, the tire itself could be deflecting, which is pretty
likely; higher pressure will help that.

Quoted message said:

So, my question is ... is this damaging to my polished aluminum frame/chainstays??

It ought to be easy enough to put some sacrificial wear material there -- some thin sheet metal
(replace when it wears through), or just a thick, tough paint applied often.

Aluminum trim coil stock sold for house exterior trim work might do.

Maybe you can trim the side knobs on the tire?

It does seem a bit silly to do all this for the sake of having too-large tires.
--
Rick Onanian

On Thu, 26 Feb 2004 22:10:40 +0100, PsyCro <[email hidden]> may

have said:

So, my question is ... is this damaging to my polished aluminum frame/chainstays??

Maybe.

Personally, I'd drop back to the tire that fits with at least 5mm of clearance.

If you're going to stay with the 2.25" knobbies, try covering the stays with a layer of the metal
foil duct tape that professional air conditioning and heating duct installations are done with. It
can be had at almost any hardware store. If that wears through, I'd definitely change the tire
before the frame gets gouged.

--
My email address is antispammed; pull WEEDS if replying via e-mail.
Typoes are not a bug, they're a feature.
Words processed in a facility that contains nuts.

Rick Onanian wrote: <snip>

Quoted message said:

I suspect the wheel itself isn't bending, but maybe the frame. If the wheel is bending, you may
not have enough tension in the spokes.

hmm. the modulus of stainless steel spoke wire does not change at any point on its elastic
deformation curve. this is nicely illustrated by damon rinard's diagram where the deflection curve
is horizontal until the spokes are actually slack.

sheldonbrown.comtension.gifOpen ↗

original page: sheldonbrown.comindex.htmOpen ↗

potentially, yes. rubbing tires, particularly on an mbt, can cause scratching with embedded grit.
scratches can be a fatigue nucleation point as they are a stress riser.

PsyCro said:

So i just got me a set of Schwable BlackJack tires 2.25" .. the biggest i can fit on my frame..
but a weee problem (maybe) exists.

ive managed to center the tires, which was a pain .. especially on my Ritchey Rock 415E rims which
ive heard are normally a [censored] to center tires with. And i have 1 millimeter clearance between the
chainstays and rear tire. So when i go into a turn, and the wheel bends, i get a little bit of
rubbing action on the chainstays.

So, my question is ... is this damaging to my polished aluminum frame/chainstays??

Werehatrack said:

PsyCro may have said:

So, my question is ... is this damaging to my polished aluminum frame/chainstays??

Maybe.

Personally, I'd drop back to the tire that fits with at least 5mm of clearance.

If you're going to stay with the 2.25" knobbies, try covering the stays with a layer of the metal
foil duct tape that professional air conditioning and heating duct installations are done with. It
can be had at almost any hardware store. If that wears through, I'd definitely change the tire
before the frame gets gouged.

3M reflective tape also makes a great frame protector. I have used in on chainstays with very
pleasing results. I think it would be more durable than foil duct tape, and it reflects!

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

Quoted message said:

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

Quoted message said:

So i just got me a set of Schwable BlackJack tires 2.25" .. the biggest i can fit on my frame..
but a weee problem (maybe) exists.

ive managed to center the tires, which was a pain .. especially on my Ritchey Rock 415E rims
which ive heard are normally a [censored] to center tires with. And i have 1 millimeter clearance
between the chainstays and rear tire. So when i go into a turn, and the wheel bends, i get a
little bit of rubbing action on the chainstays.

Dude, what happens when your wheel gets one millimeter out of true? Your Fouked!

Quoted message said:

Quoted message said:

So, my question is ... is this damaging to my polished aluminum frame/chainstays??

Eventually, yes. Short-term, no. Your tires have grit and [censored] on them

and

Quoted message said:

will eventually wear down the aluminum. How long will that take? Dunno. I've seen a tire burn
through the paint in about 100'. But that's a whole different thing. If you're dead set on those
tires, I'd ride a bit and

see

Quoted message said:

after a week or two how much of a groove has been cut in the aluminum, if

at

Quoted message said:

all. If you go a whole season and only have a barely perceptible groove, I'd say you'll probably
be fine for quite some time. Personally, I find

it

Quoted message said:

technically bush to have the tire rub the frame and I wouldn't do it! But I'm a perfectionist
sometimes...

Cheers,

Scott..