| Title: | Bicycling |
| Notice: | Bicycling for Fun |
| Moderator: | JAMIN::WASSER |
| Created: | Mon Apr 14 1986 |
| Last Modified: | Fri Jun 06 1997 |
| Last Successful Update: | Fri Jun 06 1997 |
| Number of topics: | 3214 |
| Total number of notes: | 31946 |
SEEKING ADVICE ON EXTRA STRONG REAR WHEEL
My boyfriend is 6'4" and weighs 215lbs, and so far this year has
ruined 2 $60.00 metal rear wheels. He is seeking advice on the
strongest light touring rear wheel available, compatible with a
Schwinn Le Tour Bicycle.
The problem is that the wheels BUCKLE into an "S" shape and
become untrue. Re-truing leaves some spokes overtensioned
and some undertensioned.
Any Advice would be greatly Appreciated,
Janice Salzmann, mail (CASPRO::SALZMANN)
DTN 272-7119
| T.R | Title | User | Personal Name | Date | Lines |
|---|---|---|---|---|---|
| 1177.1 | 40-spoke handbuilt | LEROUF::WILSON | John in Valbonne, France | Tue May 23 1989 04:18 | 16 |
Janice
I would suggest that your boyfriend gets a handbuilt rear wheel from a
good shop, with 40 spokes instead of the normal 36. He might consider
making one himself.
Bicycle wheels are normally immensely strong, and even a 215-pound
rider should not normally have trouble with an ordinary wheel. I say
"normally" because the problem may be one of technique: not getting out
of the saddle on bumps, for example, or going over excessively rough
ground, or carrying too much baggage on a light rim.
Regards
John
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| 1177.2 | ESKIMO::DESHARNAIS | Tue May 23 1989 09:29 | 12 | ||
I agree with .1 - most wheels should be able to tolerate a 215 pound
rider. Of course, any wheel will go out of true, but this should
take a reasonable amount of time and miles. I usually true my wheels
about once (twice max) a season.
It sounds as though your wheels are not being trued properly. The
spokes should be fairly equal in tension after being trued. I would
consider trying another wheel builder.
Regards,
Denis
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| 1177.3 | Who you calling | WFOV11::SISE | Tue May 23 1989 10:31 | 8 | |
I am 210lbs(6') and have over 200miles on my 36 hole Mavic MA40 wheeles
with NO sign of loss of trueness. These wheeles were build by my
local bike shop. I love em.
P.S. 6' 4" 215lbs is not FAT! SOOOOOOO who is the "FAT" preson asking
for help :-) Are you 5'1" 150lbs?????? :-)
John_who_could_use_to_loose_15!
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| 1177.4 | bet the spoke tension was too low... | AHOUSE::ACKLEY | Mediumfoot | Tue May 23 1989 10:46 | 44 |
I recently built a new rear wheel for a 240 pound person.
He had had problems with breaking spokes, and warping. When
I looked at his old wheel, it soon became apparent that the
spokes were not tensioned properly. When plucked, the note
from the spoke was a low bassy sort of note.
I built him a new wheel with 36 - 14 guage spokes, and tensioned
the spokes so that they have a nice midrange to treble sort of note
when plucked. He is having no problems at all with it, although
too much tension could eventually lead to other problems... (like
spokes pulling through the rim :-( )
If the tension on a spoke is too low, when that spoke passes
between the wheel and the ground, the tension is lowered, and
if there is not enough tension the spoke goes entirely slack.
Once the spoke is slack, the spoke nipple can move freely for
a moment, since the friction from the tension is all that holds
it tight. Thus *really* loose spokes are a sign that the
tension was not high enough in the first place. The entire load
on the 36 spoke wheel is supported on about four of the spokes at
a time, so if the wheel were to support a 200 lb load, each spoke
should have a minimum of 50 lbs tension.
Like .1 suggested, a wheel with more spokes is an option.
Tandem bicycles often use 48 spoke wheels, and as he said,
40 spoke wheels can also be found. This distrubutes the
tension across more spokes. A wheel like this is very
unlikely to have spoke failure, but then if you're mean
enough to it, you get into other types of failures, like
hub flange failure. One problem there could be is that such
rims and hubs are a little harder to obtain. (I've been
waiting for a 48 spoke 26 inch mountian bike rim that I had
ordered, for over two months now... I want to make a
"super" rear wheel for hauling trailer and packs on dirt roads.)
Often new bikes come with wheels that don't have enough
spoke tension. A good bike shop will check this when they
assemble the bike, but bikes from discount stores or from
shops with inexperienced help may have low tension wheels,
as well as all sorts of other loose stuff. It pays to
do business with people who really know bikes...
Alan.
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| 1177.5 | Sorry If I Offended You!! | CASV02::SALZMANN | Tue May 23 1989 10:46 | 5 | |
The title was just an attention getter--He is not Fat--It was his
idea, sorry if I offended you. BTW, I'm 5'9", 140lbs!!!
Janice
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| 1177.6 | Who me fat?? | WFOV11::SISE | Tue May 23 1989 11:36 | 2 | |
I was not offended, I just had to make the comment.
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| 1177.7 | Try Colorado Cyclist | GSFSWS::JSMITH | I Bike Solo II | Tue May 23 1989 12:10 | 10 |
I'm 225 and rode for a long time on a 40 spoke rear wheel (Nashba)
until I started braking spokes frequently. As someone already pointed
out, its not the amount of spokes but rather the spoke tension that
really counts. I purchased a set of 36 spoke Mavic MA40's from Colorado
Cyclist (Bicycle Mag Classified Pages) and have ridden them 1000 mi.
over rough New Hampshire roads without any signs of spoke problems.
If you watch the add's you can usually pick these up with Shimano 600
EX hubs for under $125. If he's just a recreational rider they might
be the last wheels you'll have to buy.
Jerry
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| 1177.8 | UR small, Im big | PNO::STARKEY | Tue Jun 19 1990 11:15 | 7 | |
I would think that you might have a riding technique problem of abusing
the bike...like hitting holes,bumps....I weigh 260lbs and am 6'1" and
I have a Trek 820s. Having had the bike for over 2 years and probably
put over 2k miles on it without any problems...execpt that of changing
out the chains when it stretches...
mike
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