Lou Holtman said:Quoted message said:Lou Holtman said:[email hidden] wrote:
>On Thu, 14 Sep 2006 19:06:43 +0200, Lou Holtman
><[email hidden]> wrote:
>
>
>
>>Jan Lindstrom wrote:
>>
>>
>>>Mike Jacoubowsky wrote:
>>>
>>>
>>>>From an economic standpoint, looking at the 6000 mile outlook-
>>>
>>>>Replace chain every 1500 miles, plus a cassette every five chains. So
>>>>actually 7500 miles to the cassette, but for now we'll say just 6000.
>>>
>>>
>>>Do the 10 speed cassettes wear that fast? All the 7 and 9 speed Shimano
>>>Sora and 105 casettes I've used have lasted more than 15 000 kms, in
>>>fact I haven't even worn one enough to replace it. I'm glad I've stayed
>>>out of 10 speed, if they should be replaced in less than 10 000 kms.
>>
>>Well mine don't wear that fast. In the beginning of this season I
>>replaced the smallest 6 cogs of my Record 10 speed cassette after 20000
>>km. I kept the 4 largest Ti cogs which I don't use that much. I bought a
>>new Veloce cassette to donate the 6 smallest cogs. Very cheap.
>>
>>
>>Lou
>
>Dear Lou,
>
>This is a nice illustration of how variety leads to different results.
>
>If you spent most of your time trudging along as I do in 53x11 at only
>20-25 mph, the low chain-speed/high-chain-tension would lead you to
>replace the 11-tooth after only 3,000 miles or less.
>
>If I spent my time using more and larger gears at a higher cadence and
>lower chain tension as you probably do, I'd have a much smaller
>collection of 7-speed cassettes. It's not much more expensive to grit
>my teeth and replace the whole cassette than to buy that single
>11-tooth.
>
>I've never worn out any but my smallest rear sprocket. When I had a
>Sachs cassette that only went to 12 teeth, I had a small box full of
>worn-out 12-tooth Sachs cogs. The Sachs 12-tooth wore much faster than
>the Shimano 11-tooth, but was easier to replace.
>
>Cheers,
>
>Carl Fogel
Yes, Carl you are right about that variety leads to different results.
On my singlespeed I run a 44 x 16 gear and a SRAM PC48 chain. I use the
same cleaning and lube regime as I do on my Campy 10 speed equiped road
bike. The chain on my singlespeed is worn only after only 1500 km where
as my C10 chains last close to 10000 km. Do you have an explanation for
that Carl.
Lou
Dear Lou,
That's interesting.
I've run PC48 chain without such rapid wear, so I wonder if the
difference has anything to do with the different transmission.
Is your single-speed a fixie or a freewheeler?
It's a freewheeler.
Quoted message said:
If it's a fixie, I'd wonder if you do a lot of starting-up and
pedal-braking around town and if that relatively high-chain-tension
riding is part of the explanation.
Have you worn out your single-speed's 16-tooth, or is it just the
chains?
No, the 16-tooth cog (not a specific singlespeed one) is also worn. I'm
wondering what's is wearing out what. The cog the chain or the chain the
cog. It is my second chain that wears so fast on my singlespeed. The
first chain was a connex stainless steel one. That was a waste of money,
so I bought a cheap PC48 and I keep running it untill it starts skipping.
Maybe I should stop wondering about it. It is only 20 euro for a new cog
and chain, but I am still suprised I get such a good mileage on my
roadbike and such a bad mileage on my singlespeed.
Lou
Dear Lou,
It's a freewheeler, so braking loads aren't involved.
The culprit might be chain tension. If the chain is too tight, then it
will wear rapidly.
The chain will also wear rapidly if the tension looks good, but the
gears are unusually out-of-round and cycle around to create a tight
spot.
Sheldon Brown has a page about adjusting chain tension for single
speed, but the www.harriscyclery.com site still seems to be down.
Of course, if you're using a spring-loaded tensioner on a single-speed
freewheeler, then chain tension isn't the problem.
It could be a bad batch of pc48 chains, but only 1500km/900 miles
seems like an awfully short chain life.
Cheers,
Carl Fogel
