R/C Tech Forums

Go Back   R/C Tech Forums > General Forums > Electric On-Road

Thread Tools Search this Thread
Old 05-03-2004, 07:40 PM   #1
Registered User
ritchie's Avatar
Join Date: Oct 2001
Posts: 2,044
Default internal ratio vs. spur gear size

ok someone help me out, is there a "perferred" spur gear size for different internal gear ratios? does it make a difference on shaft drive cars vs belt drive cars? stock motors vs. mods?
different brands of mods?
ritchie is offline   Reply With Quote
Old 05-04-2004, 03:03 AM   #2
Tech Elite
Cole Trickle's Avatar
Join Date: Sep 2001
Location: Denmark / Europe
Posts: 2,571

Not sure what you are asking about....

First: You need the proper gearing. There's no buttom line, it depends track layout, driving style and motor. The general rule of thumb, is that your car should reach top end speed, when it's 2/3-3/4 down of the longest straight. On tighter tracks, you might want one tooth less on the pinion. On more open tracks, one more tooth on the pinion.

Assuming you found the right ratio: Now you can use a larger pinion and a smaller spur and still have the same ratio. Which is best? Derpending on the car, the motor might sit lower with a larger spur. That will give you a lower center of gravity - which you'll like
Schumacher Mi5 - Sanwa MT-4 / RX-462 / KO Propo PDS-2123 - Nosram 5600 X-treme Saddle Pack - LRP SPX Zero/X12 17,5 - Nosram Stealth Touch Evolution - MAAS SPS 9250
Cole Trickle is offline   Reply With Quote
Old 05-04-2004, 07:51 AM   #3
Tech Regular
Join Date: Dec 2003
Location: Rochester, NY
Posts: 441
Trader Rating: 2 (100%+)

also for the same ratio of pinion and spur..

the larger spur and smaller pinion will give more grunt and low end power, good for tight tracks

the smaller spur and larger pinion will suffer a little on the grunt but have a better handle on higher speeds... more for open tracks

the ratio is the same, but the power outputs of each scenerio can impact your car's speed.

correct me if i am wrong, this is how i always envisioned it.
MManson is offline   Reply With Quote
Old 05-04-2004, 04:50 PM   #4
Tech Elite
Join Date: Oct 2003
Location: Green Bay,WI
Posts: 3,006
Trader Rating: 1 (100%+)
Send a message via AIM to R/C Anonymous

run the biggest 64 pitch gear you can put on your car and go from there...with a larger spur theres a smaller "jump" of final drive ratios when you change pinions
Geoff C.
R/C Anonymous is offline   Reply With Quote

Similar Threads
Thread Thread Starter Forum Replies Last Post
Transmission/Internal Gear ratio lesterrr Singapore R/C Racers 7 10-30-2007 07:51 AM
T2 Spur Gear Size butrflynlambie Electric On-Road 11 10-18-2006 05:25 AM
Internal Gear Ratio for a MF2 and a T4? BSchorr Electric Off-Road 7 03-03-2006 03:45 PM
Spur Gear Size Torqer Electric On-Road 10 08-11-2004 05:55 PM
Internal gear ratio difference advantage GTO2 Rookie Zone 1 05-25-2004 03:37 PM

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are Off

All times are GMT -7. It is currently 02:43 AM.

We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.
Powered By: vBulletin v3.9.2.1
Privacy Policy | Terms of Use | Advertise Content © 2001-2011 RCTech.net