Rim Spocket or Spur Sprocket

[RI Chevy]

Other than the obvious reasons of convertability of the Rim Sprocket, is there any cutting advantages/disadvantages of either clutch drum? One better than the other?

 

[Clemsonfor]

Rim sprocket is much cheaper to replace when it wears out. The conversion is a few more pennies if your going from clutch drum spur to rim if your talking changing one.

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[RI Chevy]

Thank you sir. I should have clarified better. I am interested in the performance differences between rim and spur.

 

[jackjcc]

You are able to change pitch and tooth count easier. I also feel spur wears faster than rim.


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[RI Chevy]

True. I have noticed that the spur sprockets do wear out faster.
How about cutability?

 

[jackjcc]

I’d don’t think there will be a difference


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[RI Chevy]

OK. That's kinda what I thought. Thanks. [emoji106]

 

[huskyboy]

I hate spur sprockets lol

 

[jackjcc]

I’ve converted everything I’ve owned to rim. Y work saws are sprocket and I feel like I put in WO’s to change them twice as often as the other crews.


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[Philbert]

Once the chain is mounted, I am not aware of any advantages.
Rim sprockets are supposed to 'self-align' the chains when cutting; whereas spur sprockets develop a wear groove.
Spur sprockets are more likely to burr drive links when a chain jumps the bar groove.
Chains are slightly easier to mount on spur sprockets.
Spur sprockets are often used with small pitch chains, due to size issues.
If I had a saw with a spur sprocket, I would not replace it with a rim sprocket until it wore out, or developed other problems.

Philbert

 

[Homemade]

Once the chain is mounted, i am not aware of any advantages.
Rim sprockets are supposed to 'self-align' the chains when cutting; whereas spur sprockets develop a wear groove.
Spur sprockets are more likely to burr drive links when a chain jumps the bar groove.
Chains are slightly easier to mount on spur sprockets.
Spur sprockets are often used with small pitch chains, due to size issues.
If I had a saw with a spur sprocket, I would not replace it with a rim sprocket until it wore out, or developed other problems.

Philbert

Once again philbert, accurate description. Nice job.

 

[RI Chevy]

Yup. And I appreciate it too. [emoji106]
I welcome the positive and negative feedback on this. For the good of the order.

 

[huskyboy]

Spurs also wear out faster and chain tension then becomes harder to manage when they have a wear groove.

 

[jakethesnake]

I’ll run either. However I prefer rims. I like to swap chains from one saw to another fairly often. If running a spur sprocket the chain drivers do get dinged up. It doesn’t bother me that much however it does bug me a little. Sorta hate putting a dinged up loop on a nice new rim sprocket. I haven’t noticed any abnormal wear on my rims due to putting a dinged chain on them though. Meh. If replacing stuff and price is similar I convert all of em to rim drive

 

[usmcbuckwild]

Once the chain is mounted, I am not aware of any advantages.
Rim sprockets are supposed to 'self-align' the chains when cutting; whereas spur sprockets develop a wear groove.
Spur sprockets are more likely to burr drive links when a chain jumps the bar groove.
Chains are slightly easier to mount on spur sprockets.
Spur sprockets are often used with small pitch chains, due to size issues.
If I had a saw with a spur sprocket, I would not replace it with a rim sprocket until it wore out, or developed other problems.

Philbert

I concur with this. I believe the rim is better, in regards to wear, than sprocket for the chain. Being able to “float” simplifies proper alignment and reduces the chance of a groove for the chain to sit in. Once the chain eats a groove in a spur, any new chains or chain/bar will be forced to ride in the previous groove which can lead to uneven wear. The rim is also “smoother” running because it dissipates more of the chain/drive vibration.

In regards to power, I truly believe a spur will make more power. Less parasitic loss with the spur because less moving parts. The rim will have more loss not just because of more parts but the rim also “rattles” on the rim sprocket. Its not a tight fit and allows vertical/lateral movement which is also parasitic loss.

That’s just my opinionated opinion

 

[kingOFgEEEks]

I converted an MS310 once, and the rim setup felt like it produced a little less vibration in the cut. Probably not enough to make any measurable difference, though.

 

[CR888]

Why do $1000+ top handle pro saws come with spur sprockets? Why do pole saws all have spur sprockets? Does a spur assist in removal of chips & prevent/prolong clogging of clutch cover? I'll take a rim setup on near all occaisions mainly due to cost and the fact a clutch drum usually takes 4+ sprockets before it needs replacing so its sensible to replace the worn part instead of drum and sprocket together which you have to do with a spur welded to a drum. But on pole saws its usually a spur by itself and a rim 'could' be used like in the design of a log wizard where they use a rim to drive the rotor. So why do OEM's by many brands choose spurs in pole saws and top handles? Just a few Q's to think about

 

[Dub11]

Why do $1000+ top handle pro saws come with spur sprockets? Why do pole saws all have spur sprockets? Does a spur assist in removal of chips & prevent/prolong clogging of clutch cover? I'll take a rim setup on near all occaisions mainly due to cost and the fact a clutch drum usually takes 4+ sprockets before it needs replacing so its sensible to replace the worn part instead of drum and sprocket together which you have to do with a spur welded to a drum. But on pole saws its usually a spur by itself and a rim 'could' be used like in the design of a log wizard where they use a rim to drive the rotor. So why do OEM's by many brands choose spurs in pole saws and top handles? Just a few Q's to think about

Most of them saws are a 6 tooth set up and so for space reasons a spur has to be used to get that small.

 

[Philbert]

Yep. Small pitch chain. Small tooth sprockets. Hard to make rims that small with a center arbor that will hold up.

Philbert

 

[RocketRoss57]

I was told by an Oregon rep the other day that some people believe that the Spurs clean out better when cutting in very dirty conditions. He said that they have a client somewhere that they cut extremely dirty wood and have swapped all their saws to spur along with hard nose bars and some series of chain that they make that has a thicker layer of chrome on the cutters. Cant remember where but if memory serves its timber that is underwater during flood seasons.