T. Kenji Sugahara
Thanks all for the feedback!
On Tue, Oct 1, 2013 at 4:40 PM, wrote:
> Wow! Bikes are complicated. Being of a simple mind........I am thinking
> Kenji wore out the 15T cog so maybe he should just be riding a SS with a 15T
> on the back. It seems he can do most of what it does with that ratio.
> Good luck Kenji!
> ron
>
> From: Drew Coleman
> Sent: Tuesday, October 01, 2013 2:28 PM
> To: Sarah Tisdale ; RickCJohnson1@gmail.com
> Cc: obra@list.obra.org
> Subject: Re: [OBRA Chat] Tech Question
>
> That was pretty much my response as well. Additionally, chains are specific
> to speeds as they too get thinner the more cogs it must navigate (SS = thick
> links, 11 speed = thinnest links).
>
> ________________________________
> From: sarah.s.tisdale@gmail.com
> Date: Tue, 1 Oct 2013 14:21:06 -0700
> To: RickCJohnson1@gmail.com
> CC: obra@list.obra.org
> Subject: Re: [OBRA Chat] Tech Question
>
> And, spacing aside, not all 15-tooth cogs are identical. With there's a
> 2-tooth jump to the next cog, there can be different ramps than when there's
> a 1-tooth jump.
>
> See the first picture on this page to see what I'm talking about:
> http://sheldonbrown.com/k9.shtml
>
> Could you make it work in a pinch? Probably. Long term? Seems like a bad
> idea.
>
>
> On Tue, Oct 1, 2013 at 2:14 PM, Rick Johnson
> wrote:
>
> I expect there would also be a spacing difference that could interfere with
> the reliability a such a substitution.
>
> Rick Johnson
> Bend, Oregon
>
> Every revolutionary idea seems to evoke three stages of reaction...
> One, it's completely impossible.
> Two, it's possible, but it's not worth doing.
> Three, I said it was a good idea all along.
>
> Arthur C. Clarke
>
> On 10/1/2013 1:50 PM, Sarah Tisdale wrote:
>
> See the last table on this page:
> http://sheldonbrown.com/cribsheet-spacing.shtml
>
> The "Sprocket Thickness" column says:
> - shimano 9sp thickness = 1.78mm
> - shimano 10sp thickness = 1.6mm
>
> Campy 9sp and 10sp cogs are much closer (1.75mm vs 1.7mm)
>
>
>
>
>
> On Tue, Oct 1, 2013 at 1:09 PM, wrote:
>
> Nope. Time to replace the bike.
>
> ________________________________
> From: "T. Kenji Sugahara"
> To: ""
> Sent: Tuesday, October 1, 2013 12:53:54 PM
> Subject: [OBRA Chat] Tech Question
>
>
> So here's a question for the geeks out there:
>
> Say for example you have a 10 speed 12-25 cassette. There's one
> sprocket that's toast. Can you grab a sprocket from a 9 speed
> cassette to replace it?
>
> (talking about a 15t cog)
>
> Thanks!
>
> --
> Kenji Sugahara
> Executive Director
> Oregon Bicycle Racing Association
> Phone: 503-278-5550
> http://www.obra.org
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