Talk:Gear ratio

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The contents of the Gear ratio page were merged into Gear train on August 2015 and it now redirects there. For the contribution history and old versions of the merged article please see its history.

This article was nominated for merging with Gear train on December 2013. The result of the discussion was Merge.

The article states "In the picture, each time the 13 teeth of the smaller gear make a revolution, 21 teeth of the larger gear make exactly one revolution." This statement is misleading or confusing. Each time 13 teeth of the smaller gear make a revolution, the larger gear has made 13/21 of a revolution.

It is not clear in this article which gear is applying power to the other. Can somebody clarify?

I accidently saved my edit before I meant to, so I didn't get to write a complete comment. I'll simply comment here, and be wordier about it!

The example section was incorrect about a few points and in places where it was correct, it was not a very good "example" (it was not representative of a realistic car). I've replaced it with a bit of an analysis of the gearing in a C5 Corvette Z06. I thought using an actual car would make the section more interesting.

It WAS based on an actual car; the Saab 96 - but you would be too young to know... MH 16:07, 11 December 2005 (UTC)[reply]

I think I've written up some pretty good information, but rereading it, it's really dry. It also needs wikification, and it uses all Imperial measurements. I'd like to fix this later, but if anyone gets to it first, please go at it! TomTheHand 18:33, 14 October 2005 (UTC)[reply]

Wikipedia should use metric/SI units by default! MH 16:07, 11 December 2005 (UTC)[reply]

A sentence was ended with a preposition.

I searched reduction gear and it redirected me to this page. There is nothing that says reduction gear, only the word reduction appears once. There needs to be some sentence that says what a reduction gear does. This redirect was useless and uninformative.

Onionmon 21:35, 9 September 2007 (UTC)[reply]

please explain how to calculate the car speed if the following known datas 1.engine speed rpm 2.gear ratio 3.final redn ratio 4.circumfarance of the tyre —Preceding unsigned comment added by 85.154.4.246 (talk) 06:44, 15 April 2008 (UTC)[reply]

I have added a link to an applet created by me that can calculate the theoretical speed at a certain rpm/gear. —Preceding unsigned comment added by Trident01 (talk • contribs) 23:49, 27 May 2008 (UTC)[reply]

21/13 = 1.61538 which leads to 1:1.62

Then 1/1.62 gives 0.62 but it is really 0.6190

The risk is that someone will see 1: 1.62 and then see 1/1.62 or 0.62 as 1-1.62

25/13 would be better

25/13 1.923 and 1:1.923

Then 1/1.923 gives 0.52

Ircoha (talk) 17:16, 29 May 2008 (UTC)[reply]

When we refer to torque multiplication in a manual transmission the affects of speed is what? —Preceding unsigned comment added by 65.191.108.82 (talk) 01:46, 1 March 2009 (UTC)[reply]

I don't think the article specifies what happens to torque on the output side of a gear. I think it is something like this but I'm just a novice and this is just a guess from information I have picked up from various web pages.

I have two gear cogs, A and B. A is my input gear, B is my output gear

R = Ratio of output B teeth over A gear teeth
rpmA = RPM that A is spinning at
rpmB = RPM that B is spinning at
torqueA = Torque of A
torqueB = Torque of B

rpmB = rpmA * (1.0 / R)
torqueB = torqueA * R

In my own calculations for the 2004 Corvette (I also added my own data such as wheel size, transmission and differential losses etc., I can post that too if anyone wants it) I then get something like 400 Nm @ 1000 RPM in 4th gear at the engine and 1200 Nm @ 300 RPM at the wheels (Does this sound good?) so you basically "trade" RPM for torque via gearing. Anyway my point is, I just want the Wikipedia article to be best it can be, it would be nice if this article stated the torque equations clearly, which at the moment I don't think it does and I am definitely not qualified enough to research, verify and make this change. Hullo exclamation mark (talk) 11:36, 14 November 2009 (UTC)[reply]

I have rewritten the introduction and revised the general description section to try to provide a clear explanation of gear ratio. Hopefully, this helps clarify many of the questions that have appeared. Prof McCarthy (talk) 23:23, 27 July 2011 (UTC)[reply]

wth is this im in school and this is very hard dumb it down wth — Preceding unsigned comment added by 168.169.228.2 (talk) 17:17, 26 April 2013 (UTC)[reply]

Torque ratio given in this article was wrong. Correct one is given in : http://en.wikipedia.org/wiki/Gear_train