Changing Inner Tube Type

[Steve]

Hi all, hoping somebody can answer a question for me. I just got a new Cannondale MTB, it has X223?
Disc wheels which use the 'thin' inner tube valves (Presta?) . Are there any advantages to these ?
As I see it I cannot even put Slime in the tyres via these valves, and I'll have to use the pump
from my racing bike.

Can I swap tubes to the normal 'fatter' type, and drill a larger hole in the wheel to accomodate
this, and has anybody done this ?

Thanks - Steve Steve www.chollie.com UKMG/MRBPF!C!H?S E4A1 GAS+/-- C= P+ G- B-- R- M= S= r+

 

[Elyob]

"Steve" <[email protected]> wrote in message news:[email protected]...
> Hi all, hoping somebody can answer a question for me. I just got a new Cannondale MTB, it has
> X223? Disc wheels which use the 'thin' inner tube valves (Presta?) . Are there any advantages to
> these ? As I see it I cannot even put Slime in the tyres via these valves, and I'll have to use
> the pump from my racing bike.
>
> Can I swap tubes to the normal 'fatter' type, and drill a larger hole in the wheel to accomodate
> this, and has anybody done this ?
>

I ws thinking about it, until I checked what everyone else running. They all had presta.

 

[Steve]

>> Can I swap tubes to the normal 'fatter' type, and drill a larger hole in the wheel to accomodate
>> this, and has anybody done this ?
>>
>
>I ws thinking about it, until I checked what everyone else running. They all had presta.
>
Oh? I've been out of cycling for two years following a crash when downhilling, 4 back operationss
later and I was considering whether to take up MTB's again when my full suspension was nicked from
my (locked) garage ! I have replaced it with a Hardtail and this has really given me the buzz to get
out again.

Seems a lot has changed in two years, I never knew any MTB with Prestas back then ! Can I get Slime
in through that valve ?

Incidentally, never assume an agreed valuation certificate from the bike shop, sent to your
insurance company, and payment of the extra premium, means that they will pay what you expect ...
not had a bean yet !

Cheers

-Steve Steve www.chollie.com UKMG/MRBPF!C!H?S E4A1 GAS+/-- C= P+ G- B-- R- M= S= r+

 

[Pete Biggs]

Steve wrote:
> Seems a lot has changed in two years, I never knew any MTB with Prestas back then ! Can I get
> Slime in through that valve ?

Don't think so. Some people make a hole in the tube to inject slime then patch. Seems nuts to me! Do
you really need slime anyway?

WrenchForce do pre-slimed tubes with presta valves.

~PB

 

[Steve]

Do you really need slime anyway?
>
>WrenchForce do pre-slimed tubes with presta valves.
>
>~PB
>
>

I always used Slime in the past and thought it was pretty good, when I changed a tube I could often
see half a dozen or so 'punctures' that had been 'slimed'. Thanks for the tip on wrenchforce -
Cheers Steve www.chollie.com UKMG/MRBPF!C!H?S E4A1 GAS+/-- C= P+ G- B-- R- M= S= r+

 

[David Damerell]

elyob <[email protected]> wrote:
>I was always told the best thing is to keep the weight of wheels down. Rather than buy carbon bits
>and pieces etc etc, buy the lightest wheels possible. Something to do with the weight spinning,
>centrifugal force or something??

Yes, this is a very common myth.
--
David Damerell <[email protected]> Kill the tomato!

 

[Elyob]

"Steve" <[email protected]> wrote in message news:[email protected]...
> Do you really need slime anyway?
> >
> >WrenchForce do pre-slimed tubes with presta valves.
> >
> >~PB
> >
> >
>
> I always used Slime in the past and thought it was pretty good, when I changed a tube I could
> often see half a dozen or so 'punctures' that had been 'slimed'. Thanks for the tip on wrenchforce
> - Cheers Steve

I was always told the best thing is to keep the weight of wheels down. Rather than buy carbon bits
and pieces etc etc, buy the lightest wheels possible. Something to do with the weight spinning,
centrifugal force or something?? I'd try and figure out why i'm getting punctures, and fix that
problem. I'm on a mountain bike with road tyres, doing 100 miles a week. I can go for months without
a puncture. (Mixture of road and towpath cycling).

 

[Michael Macclan]

"David Damerell" <[email protected]> wrote in message
news:IZn*[email protected]...
> elyob <[email protected]> wrote:
> >I was always told the best thing is to keep the weight of wheels down. Rather than buy carbon
> >bits and pieces etc etc, buy the lightest wheels possible. Something to do with the weight
> >spinning, centrifugal force or something??
>
> Yes, this is a very common myth.
> --
> David Damerell <[email protected]> Kill the tomato!

Why is this a myth? If this has been discussed elsewhere please point me in the right direction.

Michael MacClancy

 

[Steve]

>I was always told the best thing is to keep the weight of wheels down. Rather than buy carbon bits
>and pieces etc etc, buy the lightest wheels possible. Something to do with the weight spinning,
>centrifugal force or something?? I'd try and figure out why i'm getting punctures, and fix that
>problem. I'm on a mountain bike with road tyres, doing 100 miles a week. I can go for months
>without a puncture. (Mixture of road and towpath cycling).
>
>
>
>
Yes, I've heard that myself and the theory is sound, but a bit of extra weight is better imo than
punctures, although I will be doing a lot more road and gentler offroad than before, so I might just
pump 'em up extra hard and see how I get on. Cheers Steve www.chollie.com UKMG/MRBPF!C!H?S E4A1
GAS+/-- C= P+ G- B-- R- M= S= r+

 

[Elyob]

"Michael MacClancy" <[email protected]> wrote in message
news:[email protected]...
>
> "David Damerell" <[email protected]> wrote in message
> news:IZn*[email protected]...
> > elyob <[email protected]> wrote:
> > >I was always told the best thing is to keep the weight of wheels down. Rather than buy carbon
> > >bits and pieces etc etc, buy the lightest wheels possible. Something to do with the weight
> > >spinning, centrifugal force
or
> > >something??
> >
> > Yes, this is a very common myth.
> > --
> > David Damerell <[email protected]> Kill the tomato!
>
> Why is this a myth? If this has been discussed elsewhere please point me
in
> the right direction.
>

Just looking at Google discussions on the subject and there does seem to people on both sides of the
fence. One thing that does get general agreement is that rotational mass does matter. However, on a
cycle the difference is hardly noticable.

http://tinyurl.com/51vr is someone explaining stuff that I don't understand or worry about.

The difference is to do with acceleration. Different sports have more requirement for weight
lowering e.g. Formula 1.

Anyway, I'm not qualified on the subject, but i'd not use slime to keep the actual weight of the
bike down.

 

[Colin Blackburn]

Steve wrote:
>>I was always told the best thing is to keep the weight of wheels down. Rather than buy carbon bits
>>and pieces etc etc, buy the lightest wheels possible. Something to do with the weight spinning,
>>centrifugal force or something?? I'd try and figure out why i'm getting punctures, and fix that
>>problem. I'm on a mountain bike with road tyres, doing 100 miles a week. I can go for months
>>without a puncture. (Mixture of road and towpath cycling).
>>
>>
>>
>>
>
> Yes, I've heard that myself and the theory is sound,

What theory? That spinning objects are lighter. Call Eric Braithwaite!

Colin

 

[David Damerell]

elyob <[email protected]> wrote:
>"Michael MacClancy" <[email protected]> wrote in message
>>"David Damerell" <[email protected]> wrote in message
>>>elyob <[email protected]> wrote:
>>>>I was always told the best thing is to keep the weight of wheels down. Rather than buy carbon
>>>>bits and pieces etc etc, buy the lightest wheels possible. Something to do with the weight
>>>>spinning, centrifugal force or something??
>>>Yes, this is a very common myth.
>>Why is this a myth?
>Just looking at Google discussions on the subject and there does seem to people on both sides of
>the fence.

Yes, but only one side of the fence has people with a knowledge of elementary applied
mathematics in.

Weight _at the very rim_ of a wheel (in the way that the weight on a wheel is not) would demand
twice as much energy as the bike accelerates as the same weight would on the frame. So (like all
weight) it makes no difference on the flat at steady speeds, and also it is no more important uphill
than weight anywhere else. It is slightly better to save weight from the rim and tyre than from the
frame; but then one should consider that the consequences of a stupidly light wheel failing are much
more likely to be catastrophic than the consequences of, say, a stupidly light derailleur
collapsing.
--
David Damerell <[email protected]> Kill the tomato!

 

[Russell.Pinder]

Steve <[email protected]> wrote in message news:[email protected]...
> Do you really need slime anyway?
> >
> >WrenchForce do pre-slimed tubes with presta valves.
> >
> >~PB
> >
> >
>
> I always used Slime in the past and thought it was pretty good, when I changed a tube I could
> often see half a dozen or so 'punctures' that had been 'slimed'. Thanks for the tip on wrenchforce
> - Cheers Steve

Add slime / slime lite / specialised and a few others to the list of preslimed presta tubes too. IME
the slime lite tubes are far and away the best, very distinctive triangular box.

However the best solution is this http://www.justridingalong.com/shopping/index.php

Used to use slime pre eclipse but it beats it hands down.

Russ