Klein rear triangle flex.

Klein rear triangle flex.

Post by Frazer Worle » Fri, 31 Jul 1998 04:00:00


I seem to have a problem with my Klein Quantum with rear triangle flex.

It does this to such an extent that on steep climbs (I working in the
South of France this year - lots of BIG hills) - the tyre can rub
against
the frame.

This is not good - not good at all. It hard enough for me - 6'3" and
190lbs
to get up this ***y hills as it is - without having this additional
drag.

I've had a similiar problem with my Bontrager mountain bike where the
rear
wheel moves and the tyre rubs ... the fix seems to be to tighten the QR
_very_ tight ... overly so I think.

I've not noticed the problem with the Klein previously - cos I normally
live in Dallas - a place where there are no hills ... so never need to
get out of the saddle and stomp on the pedals.

I'm running 25mm tires .... I could go thinner - then the problem is
getting
them onto my MA40s. I tried 23mm tires - and could not get them onto the
rims.
Sound silly huh ... somewhat embarrassed I took them back to the shop -
and
they couldn't fit the tires .... I'm not joking ... we couldn't even get
it
half on. This is why I stick with fat 25s.

Would I have this flex problem with other frame materials .... I'm
looking to
bring a European bike back to the States .... non aluminium. I don't
think I
really want carbon - too uncomfortable ... and they're aren't really an
titanium made bikes here (the best ones come from the States) so it'll
have
to be steel I guess.

Sorry for the rambling ...

Thanks,

-F

--


 
 
 

Klein rear triangle flex.

Post by MAPaceBi » Fri, 31 Jul 1998 04:00:00

I don't think it is your frame! They are among the very stiffest.  I think it
is your WHEEL.  A typical rear wheel will flex sideways a great deal more than
almost any frame.  Your other bike does not sound like the problem is similar,
not if the axle is moving in one bike and not in another.  For that, it sounds
like you might need just an ordinary decent skewer (not a substandard
'ultralight' one) AND decent knurled axle-end nuts, which bite into the INSIDE
of the dropouts.
Mark Pace

reply to:

Quote:
><HTML><PRE>Subject: Klein rear triangle flex.

>Date: Thu, Jul 30, 1998 05:43 EDT

>I seem to have a problem with my Klein Quantum with rear triangle flex.

>It does this to such an extent that on steep climbs (I working in the
>South of France this year - lots of BIG hills) - the tyre can rub
>against
>the frame.

>This is not good - not good at all. It hard enough for me - 6'3" and
>190lbs
>to get up this ***y hills as it is - without having this additional
>drag.

>I've had a similiar problem with my Bontrager mountain bike where the
>rear
>wheel moves and the tyre rubs ... the fix seems to be to tighten the QR
>_very_ tight ... overly so I think.

>I've not noticed the problem with the Klein previously - cos I normally
>live in Dallas - a place where there are no hills ... so never need to
>get out of the saddle and stomp on the pedals.

>I'm running 25mm tires .... I could go thinner - then the problem is
>getting
>them onto my MA40s. I tried 23mm tires - and could not get them onto the
>rims.
>Sound silly huh ... somewhat embarrassed I took them back to the shop -
>and
>they couldn't fit the tires .... I'm not joking ... we couldn't even get
>it
>half on. This is why I stick with fat 25s.

>Would I have this flex problem with other frame materials .... I'm
>looking to
>bring a European bike back to the States .... non aluminium. I don't
>think I
>really want carbon - too uncomfortable ... and they're aren't really an
>titanium made bikes here (the best ones come from the States) so it'll
>have
>to be steel I guess.

>Sorry for the rambling ...

>Thanks,

>-F

>--




 
 
 

Klein rear triangle flex.

Post by Damon Rinar » Sat, 01 Aug 1998 04:00:00

Quote:

> I seem to have a problem with my Klein Quantum with rear triangle flex.

The Klein Stage I measured has considerably less lateral flex in the
rear triangle than other frames. From

     http://www.sheldonbrown.com/rinard_frametest.html:

                                 DEFLECTION
FRAME       MATERIAL        SIZE FRNT REAR
Klein Stage welded aluminum 63.5 0.27 0.12
Pinarello Gavia TSX steel   52.5 0.37 0.15
Cannondale 2.8 aluminum     50.0 0.17 0.19
Litespeed Classic Ti        56.0 0.38 0.19

The table lists deflection, which is the inverse of flex. A smaller
number means the frame deflects less, or is stiffer. This site also
lists the deflection of over fifty other frames.

Damon Rinard

Damon Rinard's Bicycle Tech Site:
http://home.earthlink.net/~rinard/

 
 
 

Klein rear triangle flex.

Post by Michael Conno » Sun, 02 Aug 1998 04:00:00

Frazer, I say wait till you get back to the states and buy a Cannondale
frame. I am 6'2" 220lbs and I have been very pleased with the Caad-3 road
frame that I have been riding the past two years. It is the first
lightwieght frame that I have owned that's not flimsy feeling. I don't think
there is a better frame out there for big, strong riders. For god sake don't
buy a steel frame...about the only steel frame I would consider would be a
Mercx Leader or some other custom job built with Columbus Max tubing. The
problem is a frame like that will run about a pound and a half more than the
Cannondale and cost three times as much. Good luck!

Michael Connor

Quote:

>I seem to have a problem with my Klein Quantum with rear triangle flex.

This is why I stick with fat 25s.
Quote:

>Would I have this flex problem with other frame materials .... I'm
>looking to
>bring a European bike back to the States .... non aluminium. I don't
>think I
>really want carbon - too uncomfortable ... and they're aren't really an
>titanium made bikes here (the best ones come from the States) so it'll
>have
>to be steel I guess.