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Old 07-26-2008, 09:53 PM   #1
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Default What's the strongest spur gear available?

Ok, so here is the deal. I currently converted from 1/8 nitro off road to race 1/10 carpet on-road.

I currently have a Team Losi JRxS Type R and I am having trouble with my spur gears stripping. Yes, my gear mesh is perfect and Im not that bad of a driver although I do hit things on occasion.

I have been using the Kimborough spur gears but they seem to be extremely flexible and I think this could be my problem.

Are there any companies out there that make a stronger, longer lasting spur gear?? I have gone through 3 Kimboroughs in the last 2 weeks


Please help!!

Thanks!

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Old 07-26-2008, 10:30 PM   #2
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That's weird.
I don't think I've stripped 3 spur gears in my whole life.
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Old 07-26-2008, 10:44 PM   #3
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uhm, maybe the STOCK losi ones are your best bet?

unless you can't run a gear ratio you want (you sig says carpet, so any losi gear should be fine), but you shouldn't have to worry about that unless you are running a 17.5 or something like that. (edit, i just saw that you were)

if you honestly have to go below about 4.75 (where my car is geared at, with a high 40 pinion and a 118 spur), you may want to consider some losi offroad 48 pitch gears, (im not sure exactly what model they are from), but if they have the same hole pattern, they should mount up fine (note: this IS the kevlar gear i am talking about).

good luck, if not try PRS gears, they seem fine.

Also, are your pinions worn? a worn pinion may ware gears prematurely
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Old 07-26-2008, 11:18 PM   #4
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My pinion gear is brand new, with no signs of any damage at all.

according to gearchart.com, my transmission ratio is 1.83:1

Im using a 52 pinion and a 104 spur which gives me a 3.66 gear ratio.

I do notice that the Kimborough gears are very flexable. Im sure that with any good hit, the gear can flex causing it to bind in the mesh.

I dont know, Im a new driver to on-road and maybe if I learn to stay off the boards a little I wont have this problem. It just seems that with one hit, the gear shreds.

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Old 07-26-2008, 11:25 PM   #5
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wow, a 3.6.

did you make sure your motor isn't moving on its mount?


if it isnt, id say go with PRS gears.

Or, if it still doesn't work, you can try some courser, more forgiving 48 pitch gears.

sorry i can't help more.
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Old 07-26-2008, 11:33 PM   #6
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Thanks for the help and info.


The motor is secure, ive checked it several times.

I am running rubber tires with a 17.5, is having a 3.66 ratio bad??

My motor temps at 130 max, 115-120 while driving ( I have Telemetry)

Should I gear up or down??
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Old 07-26-2008, 11:36 PM   #7
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Quote:
Originally Posted by Cory B View Post
Thanks for the help and info.


The motor is secure, ive checked it several times.

I am running rubber tires with a 17.5, is having a 3.66 ratio bad??

My motor temps at 130 max, 115-120 while driving ( I have Telemetry)

Should I gear up or down??
no dude, its not bad at all. i was just giving you a hard time because of how rediculus you have to gear 17.5 (i run 10.5 btw).

Have you checked if the spur is mounted proporly and secure without play? that may be the culprit.

-Kyle
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Old 07-26-2008, 11:46 PM   #8
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the spur is mounted properly, i check it all the time. I will just have to try the PRS spur. I think that the Kimbourough is just way to "flimsy".

Maybe if I tried a 100/50 set up, this will give me a smaller spur and may reduce flex while keeping my 3.66 ratio.

Thanks again for all your help

Cory
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Old 07-27-2008, 04:10 AM   #9
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As you mentioned, the flex in the spur gear is not reassuring or confidence inspiring ( personally I don't like it so I avoid it ).
If you want a stiffer spur (the Losi items are a very good option IMO) go for something made of nylon (usually they are white in color) companies such as : RW-Racing, Robinson-Racing, PRS, Speed-Mind, Yokomo, Hirosaka, Kawada and many more I can't remember right now all make great spurs. Pop into your LHS and see what's hanging on the wall.
Hope this helps
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Old 07-27-2008, 07:41 AM   #10
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I stripped a few spurs with my jrxs-r also. I think it has something to do with the fact that the spur gear is mounted outside the bulkhead and isn't supported as well as normal set ups.
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Old 07-27-2008, 08:09 AM   #11
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Replace the layshaft from the Type R for the one from the first gen JRXS and your problem should be solved. The machined shaft has flex to it where as the one from the old car is solid. Here is the part you need: http://www.losipartshouse.com/servle...aft-Set/Detail It is a direct replacement, no modification necessary.
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Old 07-27-2008, 12:11 PM   #12
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Sounds like Yeti has been there... done that... got the t-shirt

I like these spur gears:

http://www3.towerhobbies.com/cgi-bin...?&I=LXEZ12&P=7
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Old 07-27-2008, 12:22 PM   #13
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Quote:
Originally Posted by Yeti35 View Post
Replace the layshaft from the Type R for the one from the first gen JRXS and your problem should be solved. The machined shaft has flex to it where as the one from the old car is solid. Here is the part you need: http://www.losipartshouse.com/servle...aft-Set/Detail It is a direct replacement, no modification necessary.
+1 also check your PRS adapter I had problems with mine in the past.
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Old 07-27-2008, 05:45 PM   #14
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try Corally or PRS spur gears
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Old 07-27-2008, 05:56 PM   #15
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Quote:
Originally Posted by slakr View Post
Sounds like Yeti has been there... done that... got the t-shirt

I like these spur gears:

http://www3.towerhobbies.com/cgi-bin...?&I=LXEZ12&P=7
Yep, I did that last year at IIC running a oneway on my rubber car. It seems when you hit a board on throttle motor turns the drive line one way which the one way does not want it to turn and you just get enough flex out of the lay shaft to strip the spur.
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