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Narrow inline gears


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#1 SlowBeas

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Posted 16 January 2017 - 09:36 AM

Any recommendation of a good narrow(er) production gear to use in a tight space? I know there was some talk earlier about narrowing the Parma gear and then add'l talk of Gugu's gears. Just looking for opinions on the best alternative -- and where to find them.

 

Thanks.

jb


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#2 Dominator

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Posted 16 January 2017 - 10:07 AM

Here are the width of the crowns I measured:

BSV (Go Fast) is .246
Koford is .335
Red Fox. 295

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#3 Jeff Bonanno

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Posted 16 January 2017 - 10:43 AM

I've been liking the Red Fox lately more then the Parma.



#4 SlowBeas

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Posted 16 January 2017 - 08:12 PM

I have to admit that I've only used Parma in the past...but they're so wide that it can make for a tight fit inside some motor brackets.

 

From the measurements provided, it would appear that Red Fox and BSV/Go Fast might be promising. Will need to find someone who sells them now.

 

Thanks for the help.

jb


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South Carolina, USA

"Assuming either the Left Wing or the Right Wing gained control of the country, it would probably fly around in circles."
- Pat Paulsen, 1968
"I drive way too fast to worry about cholesterol."
- Steven Wright ca. 1983

#5 Cap Henry

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Posted 16 January 2017 - 09:18 PM

What is your issue with needing more room exactly? Is this retro applications or something different?

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#6 SlowBeas

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Posted 16 January 2017 - 09:52 PM

It's retro, Cap. I have a few chassis that have the smaller motor brackets and, once those brackets are fortified internally, it makes a really tight fit for Parmas. I don't have easy access to other crown gears to measure and try for myself. It's good to have input from others.


Jim Beasley
South Carolina, USA

"Assuming either the Left Wing or the Right Wing gained control of the country, it would probably fly around in circles."
- Pat Paulsen, 1968
"I drive way too fast to worry about cholesterol."
- Steven Wright ca. 1983

#7 Eddie Fleming

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Posted 17 January 2017 - 07:11 AM

The one measurement not in post #2 is the parma gear. If you are able to make the parma work you should have no spacing problem with any of the other three. The Parma is the widest of the bunch, but I like the Parma. I have been using Parma and Koford.

 

The Parma measures .40 so even the Koford is .065 narrower. This is measuring the full width of the hub. the differences will be less if you measure the tooth area of the gear.


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#8 Cap Henry

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Posted 17 January 2017 - 07:46 AM

Not criticizing by any means just trying to understand.

What I was going to mention is if you use a bottom bracket inside the motor bracket, you'll have to open it or the other gears won't fit, except for maybe the narrowed koford.

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#9 Eddie Fleming

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Posted 17 January 2017 - 09:23 PM

Jim this is a very bad photo, but should give you an idea of what the differences are. From the left Red Fox, Parma, Koford (early Koford but should give you a reference). 

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#10 slotcarone

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Posted 17 January 2017 - 10:46 PM

I have seen some Retro chassis with a 3/4 inch bracket that do not have too much clearance when using a 9 tooth pinion but never one that did not clear a Parma gear. The bracing needs to be done with that in mind. :)


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#11 Cap Henry

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Posted 17 January 2017 - 10:51 PM

A Parma with a 9 you need to cut the axle tube off flush with the inside of the bracket or you'll have issues, the other gears do have more room in that sense
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#12 SlowBeas

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Posted 18 January 2017 - 01:05 PM

I'd like to further investigate the Red Fox gears, from the looks of it. They appear to offer a nice bit of wiggle room.

 

Thanks to all for your input.

jb


Jim Beasley
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"Assuming either the Left Wing or the Right Wing gained control of the country, it would probably fly around in circles."
- Pat Paulsen, 1968
"I drive way too fast to worry about cholesterol."
- Steven Wright ca. 1983

#13 JerseyJohn

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Posted 18 January 2017 - 04:05 PM

Right you are Cap. And even than with a Parma there will still be some gear contact
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#14 slotcarone

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Posted 18 January 2017 - 04:47 PM

Just set up an F1 last night. Straight 9 tooth with Parma 27. Tubes cut almost flush with bracket. Plenty of room on this one.

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#15 Cap Henry

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Posted 18 January 2017 - 08:18 PM

I believe a straight 9 is smaller then a tapered one, so good idea Mike!

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