David Whitmon view: flat | tree
Subject: Re: [touring] Chain stress from cross chaining
Date: 4/6/2011 4:28:03 PM
List: Touring
I can't say that the folks who made recumbents knew that. This is the
first I've ever heard this thought. I do know that both my
velomobile and triplet use the same Sedis 9 speed chains.

David

On Apr 6, 2011, at 7:03 PM, Mark Boyd wrote:

> Steve:
>
> And i submit that the folks who made the recumbents knew they could
> use weaker chains ;-}. Since they need roughly 2.5 regular chains for
> each recumbent, it makes sense to use chains that cost less and are
> less able to stand side stresses than th chains on a regular bike.
>
> Mark
>
>
>
> On Wed, Apr 6, 2011 at 3:53 PM, David Whitmon
> <whitmon@vineyard.net> wrote:
>> I use the same 9 speed chains on my recumbent velomobile as I do
>> on my
>> Santana triplet.
>>
>> David
>>
>> On Apr 6, 2011, at 3:28 PM, Steve Fuller wrote:
>>
>>> I'd submit that the difference in your chains has nothing to do with
>>> designing around stresses from cross chaining, but is just a
>>> difference in
>>> the general chain design.
>>>
>>> Steve
>>> Sent via BlackBerry from T-Mobile
>>>
>>> -----Original Message-----
>>> From: Mark Boyd <markjboyd@gmail.com>
>>> Sender: bicycletouring@googlegroups.com
>>> Date: Wed, 6 Apr 2011 09:56:55
>>> To: Jeremy Kindy<jeremy.kindy@gmail.com>
>>> Reply-To: markjboyd@gmail.com
>>> Cc: MH<hoagy@nelson-tel.net>; <bicycletouring@googlegroups.com>
>>> Subject: [touring] Chain stress from cross chaining
>>>
>>> This effect is, of course, absent on recumbent. It is also
>>> significantly less of a problem on a touring bike, with long chains
>>> stays, than it is on a racing bike with short chain stays.
>>>
>>> i regularly run middle/big on my touring bikes but hate using in on
>>> racing bike because, with short chain stays, i can hear the chain is
>>> being stressed.
>>>
>>> My recumbents use chains with pins that are very easy to push in or
>>> out. My regular bikes use chain with pins that are very hard to push
>>> in or out and the pins actually damage the side plates when they are
>>> inserted and then removed. That difference is necessary to keep the
>>> chains from breaking when subject to heavy load while cross chained.
>>>
>>> Mark
>>>
>>> PS I changed the title since this thread now has nothing to do with
>>> cranks or STI. Whe you take a thread off in a new direction, you
>>> should change, or add to, its title so folks searching for
>>> information
>>> about the new topic can find it.
>>>
>>> PPS In gmail, at least, there is a button that lets you edit the
>>> title
>>> of your reply.
>>>
>>> On Wed, Apr 6, 2011 at 9:14 AM, Jeremy Kindy
>>> <jeremy.kindy@gmail.com>
>>> wrote:
>>>>
>>>> My (limited) understanding is that if you use the small-small or
>>>> big-big combinations on a diamond frame bicycle (much shorter
>>>> chain -
>>>> typically around 116 links or less), the chain will wear/stretch
>>>> faster due to the uneven loading because the chain has to "bend"
>>>> from
>>>> the chainrings to the cassette.
>>>>
>>>> See http://www.sheldonbrown.com/gears.html - "What's What" near the
>>>> end of the page.
>>>>
>>>> Jeremy
>>
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