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Main
Date: 17 Sep 2006 01:15:20
From: Chuck
Subject: my trike
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After I got hit by a car I re-built my Easy-3 and went with 26" wheels
in the rear and a 20" wheel in the front; I have my reasons. After some
months I've noticed that my rear wheels now need to be re-trued (?). So
now I'm thinking I'd like to lose the spokes all together and go with
wheels that can withstand the stress. Is there such an animal? Who makes
it?
Again; I have my reasons for going with bigger wheels.
Your informed input would be greatly appreciated.
Thanks,
Chuck Trotter
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Date: 17 Sep 2006 00:05:24
From: Johnny Sunset aka Tom Sherman
Subject: Re: my trike
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Chuck Trotter wrote:
> After I got hit by a car I re-built my Easy-3 and went with 26" wheels
> in the rear and a 20" wheel in the front; I have my reasons. After some
> months I've noticed that my rear wheels now need to be re-trued (?). So
> now I'm thinking I'd like to lose the spokes all together and go with
> wheels that can withstand the stress. Is there such an animal? Who makes
> it?
> Again; I have my reasons for going with bigger wheels....
An analysis of how a spoked wheel carries loads indicates that it an
excellent design in terms of strength to weight for loads that are
perpendicular to the hub. However, their ability to resist lateral
loads is rather poor, which is of small consequence in a single-track
vehicle. For this reason, most multi-track HPV's use small diameter
wheels.
It would be possible to build wheels that replace the spokes with a
smaller number of larger diameter struts that have moment connections
to the hub and rim, or disc wheels where the surface is a structural
member with significant structural rigidity. However, designing such
wheels to have a reasonable weight and cost is far from trivial.
In practical terms, the most reasonable approach may well be to build
stronger conventional spoked wheels. Build the wheels on the widest
hubs (spoke flange to spoke flange) available. If 48-spoke hubs can be
found, use them. For rims, use one of the stronger downhill/freestyle
ATB rims (e.g. Sun BFR), built with proper spoke tension, as little
spoke windup as practically possible, and stress relived prior to final
truing.
--
Tom Sherman - Here, not there.
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Date: 17 Sep 2006 07:44:37
From: Chuck
Subject: Re: my trike
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Chuck Trotter wrote:
After I got hit by a car I re-built my Easy-3 and went with 26" wheels
in the rear and a 20" wheel in the front; I have my reasons. After some
months I've noticed that my rear wheels now need to be re-trued (?). So
now I'm thinking I'd like to lose the spokes all together and go with
wheels that can withstand the stress. Is there such an animal? Who makes
it?
Again; I have my reasons for going with bigger wheels....
Tom wrote:
An analysis of how a spoked wheel carries loads indicates that it an
excellent design in terms of strength to weight for loads that are
perpendicular to the hub. However, their ability to resist lateral loads
is rather poor, which is of small consequence in a single-track vehicle.
For this reason, most multi-track HPV's use small diameter wheels.
It would be possible to build wheels that replace the spokes with a
smaller number of larger diameter struts that have moment connections to
the hub and rim, or disc wheels where the surface is a structural member
with significant structural rigidity. However, designing such wheels to
have a reasonable weight and cost is far from trivial.
In practical terms, the most reasonable approach may well be to build
stronger conventional spoked wheels. Build the wheels on the widest hubs
(spoke flange to spoke flange) available. If 48-spoke hubs can be found,
use them. For rims, use one of the stronger downhill/freestyle ATB rims
(e.g. Sun BFR), built with proper spoke tension, as little spoke windup
as practically possible, and stress relived prior to final truing.
--
Tom Sherman - Here, not there.
Thanks Tom,
I had my LBS build my present wheels using the hubs from the former 20"
wheels, which only provided for 36 spokes. The guy who built em did an
excellent job; however the roads I ride on leave alot to be desired. The
wheels are not too out of true and it took several months for them to
get where they are so I'm thinking I'll live with em and just get em
re-trued every so often.
Chuck Trotter
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Date: 17 Sep 2006 04:19:39
From: sfb
Subject: Re: my trike
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Don't wheels with camber increase lateral load and instability? Are spoke
wheels just one link in the alignment chain which includes axle, hubs, etc?
"Johnny Sunset aka Tom Sherman" <sunsetss0003@yahoo.com > wrote in message
news:1158476724.903291.213530@m73g2000cwd.googlegroups.com...
>
> Chuck Trotter wrote:
>> After I got hit by a car I re-built my Easy-3 and went with 26" wheels
>> in the rear and a 20" wheel in the front; I have my reasons. After some
>> months I've noticed that my rear wheels now need to be re-trued (?). So
>> now I'm thinking I'd like to lose the spokes all together and go with
>> wheels that can withstand the stress. Is there such an animal? Who makes
>> it?
>> Again; I have my reasons for going with bigger wheels....
>
> An analysis of how a spoked wheel carries loads indicates that it an
> excellent design in terms of strength to weight for loads that are
> perpendicular to the hub. However, their ability to resist lateral
> loads is rather poor, which is of small consequence in a single-track
> vehicle. For this reason, most multi-track HPV's use small diameter
> wheels.
>
> It would be possible to build wheels that replace the spokes with a
> smaller number of larger diameter struts that have moment connections
> to the hub and rim, or disc wheels where the surface is a structural
> member with significant structural rigidity. However, designing such
> wheels to have a reasonable weight and cost is far from trivial.
>
> In practical terms, the most reasonable approach may well be to build
> stronger conventional spoked wheels. Build the wheels on the widest
> hubs (spoke flange to spoke flange) available. If 48-spoke hubs can be
> found, use them. For rims, use one of the stronger downhill/freestyle
> ATB rims (e.g. Sun BFR), built with proper spoke tension, as little
> spoke windup as practically possible, and stress relived prior to final
> truing.
>
> --
> Tom Sherman - Here, not there.
>
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