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Measurements

Old 12-28-13, 09:48 AM
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minicoopers05
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Measurements

Looking at a very nice X0 SRAM derailleur on eBay. He doesn't know the cage length but states 95mm or 95cm--can't remember at this moment. Can anyone tell me the length of a long cage please? Thanks.
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Old 12-28-13, 10:12 AM
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IDK ... . SRAM has a website..
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Old 12-28-13, 10:25 AM
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95 cm would be about 3 feet, so that seems unlikely.
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Old 12-28-13, 10:27 AM
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Duh...

Originally Posted by fietsbob View Post
IDK ... . SRAM has a website..
Of course I went there FIRST! Their spec page doesn't give the cage length. But no worries, I did a metric conversion of 95mm = 3.7". I'll simply measure my long cage X9 and compare.
Thanks.
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Old 12-28-13, 10:37 AM
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yea, you need, really need to get up to speed on the Metric system .. [around since 1799]

95cm is 0.95M, 1M is over a Yard, by 3 ".

buy a vernier digital caliper and an inch/Metric tape measure.

Last edited by fietsbob; 12-28-13 at 10:40 AM.
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Old 12-28-13, 11:20 AM
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Originally Posted by fietsbob View Post
yea, you need, really need to get up to speed on the Metric system .. [around since 1799]

95cm is 0.95M, 1M is over a Yard, by 3 ".

buy a vernier digital caliper and an inch/Metric tape measure.
One doesn't need the precision of a vernier caliper for this kind of stuff, a tape measure or ruler is fine. Metric/inch doesn't matter either since conversion is easy enough.
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Old 12-28-13, 11:21 AM
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Originally Posted by fietsbob View Post
. . . buy a vernier digital caliper . . .
?!
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Old 12-28-13, 11:22 AM
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They are still damn handy.. I use mine (like) when I forget what string gage

I put on my Guitar and Mandolin, last. and etc.
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Old 12-28-13, 08:39 PM
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oops ...hehehe

steel spoke rulers are useful. Nashbar ? Keep mine magnet glued to the wall in 'plain site.'

Summit Racing has a digital for $30...this bolt measures 1.xxx. Then take the gauge to the hardware store.

But if you search for long and short derailleur cages in Google Images, the difference will be apparent.

There is or was a derailleur history website with all devices photographed and discusssed

Normal around town or touring use calls for a long cage.
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Old 12-29-13, 09:22 AM
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Originally Posted by fietsbob View Post
yea, you need, really need to get up to speed on the Metric system .. [around since 1799]

buy a vernier digital caliper and an inch/Metric tape measure.
You really need to to get up to speed on the Vernier Principle.
Around for about 2000 years and "rediscovered" about 400 years ago.

http://en.wikipedia.org/wiki/Vernier_scale
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Old 12-29-13, 11:14 AM
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Now, the digital ones make life even simpler ..
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Old 12-29-13, 11:39 AM
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Originally Posted by fietsbob View Post
Now, the digital ones make life even simpler ..
It depends on what you mean by simpler. Dial calipers are vulnerable to dirt or metal fines in the rack, and are either imperial or metric. Electronic calipers are nice and handle both inch and metric, which is a plus. However if you don't use it often, the one time you need it late at night, Murphy's Law will apply and the battery will be dead.

OTOH- my vernier caliper in both inch and metric, just about bulletproof, and can lie in my toolbox and be ready whenever I need it.

BTW- I have and use multiples of all three on the shop floor, according to the advantages/disadvantages of each, but it's the vernier that's in my traveling tool box.
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Old 12-29-13, 12:30 PM
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I bought an "Inch" Vernier about 45 years ago. I bought a dial about 44 years 362 days ago.
Let's see, 43/256" equals......
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Old 12-29-13, 01:25 PM
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Originally Posted by FBinNY View Post
It depends on what you mean by simpler. Dial calipers are vulnerable to dirt or metal fines in the rack, and are either imperial or metric. Electronic calipers are nice and handle both inch and metric, which is a plus. However if you don't use it often, the one time you need it late at night, Murphy's Law will apply and the battery will be dead.

OTOH- my vernier caliper in both inch and metric, just about bulletproof, and can lie in my toolbox and be ready whenever I need it.

BTW- I have and use multiples of all three on the shop floor, according to the advantages/disadvantages of each, but it's the vernier that's in my traveling tool box.
My "inch" dial caliper plus a digital calculator = metric caliper. All I have to do is multiply by 25.4. And, yes, keeping the thing clean is a necessity as dirty calipers, no matter what the type, give erroneous readings if dirt gets between the jaw.

I also have a micrometer with a mechanical "digital" reading window and a vernier scale too. Best of all worlds and no battery to die.
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Old 12-29-13, 01:45 PM
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Originally Posted by HillRider View Post
....And, yes, keeping the thing clean is a necessity as dirty calipers, no matter what the type, give erroneous readings if dirt gets between the jaw....
As I said, We use all three types depending on the application. The problem of dirt on the jaw causing error is ommpn to all calipers and micrometers, but experienced users solve this with US government issue, cotton/linen jaw wipers.

My reference to dirt issues with dial calipers isn't at the jaw, but at the gear rack. Small chips or debris can make the pinion slip causing errors. Also continued use with a dirty rack can damage or negate the "anti-backlash system leaving you with a caliper which gives inconsistent readings off by .1mm or so if the same item is measured a few times.
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Old 12-29-13, 08:31 PM
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Originally Posted by FBinNY View Post
As I said, We use all three types depending on the application. The problem of dirt on the jaw causing error is ommpn to all calipers and micrometers, but experienced users solve this with US government issue, cotton/linen jaw wipers.

My reference to dirt issues with dial calipers isn't at the jaw, but at the gear rack. Small chips or debris can make the pinion slip causing errors. Also continued use with a dirty rack can damage or negate the "anti-backlash system leaving you with a caliper which gives inconsistent readings off by .1mm or so if the same item is measured a few times.
Cotton/linen jaw wipers? How crude. Only fine silk will do!

I understood your original comments on dial calipers and, of course, if you damage the rack, it won't read accurately. However, these days really accurate dial calipers are so cheap that a damaged one can be replaced at low cost and, given decent care, they last for years anyway.
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Old 12-29-13, 08:38 PM
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Originally Posted by HillRider View Post
Cotton/linen jaw wipers? How crude. Only fine silk will do!

.....
Yes, but the dept. of the Treasury doesn't make these as readily available.
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