• Welcome to RCTalk! 🚀

    Join the #1 RC community where hobbyists connect, share, and get expert advice on RC cars, trucks, boats, drones, and more!

    • ✓ Friendly & passionate RC enthusiasts
    • ✓ RC tips & troubleshooting
    • ✓ Buy, sell & trade RC gear
    • ✓ Share builds & upgrades

36 tooth spur gear

This site may earn a commission from merchant affiliate
links, including eBay, Amazon, and others.
J

John3533

RC Newbie
Messages
4
Reaction score
0
Points
0
Location
Minnesota
RC Driving Style
  1. Bashing
stock gearing off the motor is this a bad idea what will the outcome from this be I had it in my head when I ordered the parts but now lol I forgot more acceleration or more speed? any help will be appreciated I feel so dumb now:hehe:
 
I'll be brutally blunt here dude, personally I can only guess as to what you asking.
Given that this is a very technical hobby, it would be really nice if you articulate your questions using complete sentences or thoughts.

Since the stock spur gear is 38T and your heading is "36 tooth spur gear" and you mentioned ordering parts, I'm guessing that you ordered a 36 tooth spur gear and are wondering if that would give you a higher top end or better acceleration over the stock spur gear.

A 36 tooth spur gear will give you a higher top end (more speed) but slower acceleration than the stock 38 tooth spur gear.
The 40 tooth spur gear will give you faster acceleration but less top end speed than the 38 tooth spur gear.

You can also achieve similar results by changing out the clutch bell, but the opposite is true concerning tooth count.
More teeth on the clutch bell = a higher top end.
Less teeth on the clutch bell = faster acceleration.
 
TGL said:
I'll be brutally blunt here dude, personally I can only guess as to what you asking.
Given that this is a very technical hobby, it would be really nice if you articulate your questions using complete sentences or thoughts.

Since the stock spur gear is 38T and your heading is "36 tooth spur gear" and you mentioned ordering parts, I'm guessing that you ordered a 36 tooth spur gear and are wondering if that would give you a higher top end or better acceleration over the stock spur gear.

A 36 tooth spur gear will give you a higher top end (more speed) but slower acceleration than the stock 38 tooth spur gear.
The 40 tooth spur gear will give you faster acceleration but less top end speed than the 38 tooth spur gear.

You can also achieve similar results by changing out the clutch bell, but the opposite is true concerning tooth count.
More teeth on the clutch bell = a higher top end.
Less teeth on the clutch bell = faster acceleration.
Click to expand...



This sounds backwards to my experience the 36 spur gave me wheelies, the 38 more top end, and a 40 would fly and no wheelies...with a stock 15 tooth clutch gear.
 
Last edited:
jwbigtex said:
This sounds backwards to my experience the 36 spur gave me wheelies, the 38 more top end, and a 40 would fly and no wheelies...with a stock 15 tooth clutch gear.
Click to expand...

Your backwards. Your results were probably due to erratic tuning. Bigger spur/smaller bell= less top end, more torque. Bigger bell and smaller spur, more top end and less torque.
 
Metalhead Matt said:
Your backwards. Your results were probably due to erratic tuning. Bigger spur/smaller bell= less top end, more torque. Bigger bell and smaller spur, more top end and less torque.
Click to expand...

You are right, I was thinking backwards...now I have to go back and looky at my shotty ass tuning... Anyways guy here is a chart to help ya.

The lower the gear ratio the more mph you will recieve. The higher the gear ratio the more low end you will notice(the pull out of a corner will also make things wanna wheelie).

The RATIO is the number of revolutions the pinion gear(revo people tend to refer to
it as a clutch bell because the gears are tied on it) makes for every
one revolution of the spur gear.

Spur/Clutch Bell= Gear Ratio in other words....number of spur teeth, divided by the number of teeth on your pinion gear(clutchbell) = the gear ratio. Example 35/14=2.500
Heres the chart, its made for the common gear combos for a revo but I would imagine the formulas the same for gearing on everything.

Spur Gear------------ Clutch Bell -------------Gear Ratio (rounded to 4th)

35---------------------- 14 -------------------- 2.5000
36---------------------- 14 -------------------- 2.5714
38---------------------- 14 -------------------- 2.7143
40---------------------- 14 -------------------- 2.8571

35---------------------- 15 -------------------- 2.3333
36---------------------- 15 -------------------- 2.4000
38---------------------- 15 -------------------- 2.5333
40---------------------- 15 -------------------- 2.6667

35---------------------- 16 -------------------- 2.1875
36---------------------- 16 -------------------- 2.2500
38---------------------- 16 -------------------- 2.3750
40---------------------- 16 -------------------- 2.5000

35---------------------- 17 -------------------- 2.0588
36---------------------- 17 -------------------- 2.1176
38---------------------- 17 -------------------- 2.2353
40---------------------- 17 -------------------- 2.3529

35----------------------18 --------------------- 1.9444
36----------------------18 --------------------- 2.0000
38----------------------18 --------------------- 2.1111
40----------------------18 --------------------- 2.2222
 

RC Builds

Back
Top