Cheap source for 80T chainrings

[lostrack]

I've been searching for weeks for a cheaper alternative than greenspeed chainrings, at $250, they're not cheap.

I've also followed the CNC route, which is cheap if you know the right people, but 'front door' prices are around £250-350. The actual material cost is around £10. Cheapest I found was £100 excluding materials, by winning a friendly team on-side. Still pricey.


As I'm based in the UK it's cheaper to import from Europe - I found this place which does an 80T chainring, 130mm bcd, with a integrated bashguard. All made from CNC'd 6082 ALU. The bashguard should add some strength.

http://www.specialbikeparts.nl/comp...re=nl&___store=en&manufacturer=27&price=2,100

Hope this helps anyone. It's Matt's recommended size for his 3220 direct drive systems.

*edit - with postage comes to EUR120. (£100)

T

 

[Miles]

See also: http://endless-sphere.com/forums/viewtopic.php?p=17970#p17970

There was another company in Australia that I can't find the reference to, at the moment..
Edit: This one, I think: http://cycleunderground.com.au/

 

[John in CR]

Since when did 120 euros for a sprocket become cheap? Under 20 bucks might be called cheap, though under $10 would be a lot better. I'd classify 120 euros for a bike chain sprocket as larcenous.

 

[recumpence]

Since when did 120 euros for a sprocket become cheap? Under 20 bucks might be called cheap, though under $10 would be a lot better. I'd classify 120 euros for a bike chain sprocket as larcenous.

You apparently have never tried to source an 80 tooth sprocket.........

Matt

 

[lostrack]

Since when did 120 euros for a sprocket become cheap? Under 20 bucks might be called cheap, though under $10 would be a lot better. I'd classify 120 euros for a bike chain sprocket as larcenous.

You apparently have never tried to source an 80 tooth sprocket.........

Matt

John, that's exactly what I thought when I started looking..!

 

[cwah]

I'm also interested into 80T chainring and I'm based in UK too. I was looking on ebay but haven't found anything :lol:

 

[Hillhater]

for those considering "lowracers" approach / using self made modified saw blades etc..
remember you dont actually need a full tooth set on those big sprockets. Providing you get the PCD and tooth pitch correct, you can "skip" many of the teeth since they are not needed for drive transmission with high tooth count sprockets.
So an 80T sprocket might only have 40T actually on it..or even less !

 

[John in CR]

Since when did 120 euros for a sprocket become cheap? Under 20 bucks might be called cheap, though under $10 would be a lot better. I'd classify 120 euros for a bike chain sprocket as larcenous.

You apparently have never tried to source an 80 tooth sprocket.........

Matt

Just because only thieves sell them doesn't make the price any less larcenous. I've purchased sprockets with teeth counts in the 70's, 80's, and 90's for under $10ea. They're not for bike chain, but it demonstrates a perfectly reasonable starting point. I've also purchased bike sprockets for under $10 too, both steel and alloy. While they're not 80T, they do have more material than these 80T chainrings, so they too establish a starting point.

John

 

[recumpence]

Since when did 120 euros for a sprocket become cheap? Under 20 bucks might be called cheap, though under $10 would be a lot better. I'd classify 120 euros for a bike chain sprocket as larcenous.

You apparently have never tried to source an 80 tooth sprocket.........

Matt

Just because only thieves sell them doesn't make the price any less larcenous. I've purchased sprockets with teeth counts in the 70's, 80's, and 90's for under $10ea. They're not for bike chain, but it demonstrates a perfectly reasonable starting point. I've also purchased bike sprockets for under $10 too, both steel and alloy. While they're not 80T, they do have more material than these 80T chainrings, so they too establish a starting point.

John

Good grief John, give me a freakin break. The aluminum, alone, for a 80 tooth sprocket would cost twice that amount. That sprocket is 13 inches in diameter and, with such a large size, it has to be relatively thick. Then there is the machining time.

I agree that $250 is obsene. However, suggesting $10 for something like this is absolutely insulting and wrong and you ought to know better. Just because someone had some other sprockets left from overstock, does not mean that price can be applied to every sprocket in the world. A sprocket like this is a custom item. THey are not made 1,000 at a time. So, the cost goes up. Very few people buy these.

There is a company here in the states that CNC machines custom sprockets that are roughly $1 per tooth. So, $80 for an 80 tooth sprocket. That is reasonable for something custom.

I get frustrated when people throw around numbers that are just plain wrong. I am not saying you did not pay that. You found someone who had an overstock of some basic stamped sprockets. Fine. However, to suggest that this sprocket should cost $10 is misleading to newbies. Those of us who are knowledgeable can sift through incorrect statements or misapplied statements. However, others cannot.

Matt

 

[Idontwanttopedal]

Matt could you some made up and sell them with your kit

 

[bobc]

I've not bought a sprocket (chainring) for years now, I get 'em lasered locally. I'd expect to make an 80tooth sprocket out of 2mm stainless & get it for about £20 - 1 off. It gets a bit cheaper if you buy a few. As said above, you'd need to do a lot of post- machining to a sufficiently stiff (i.e. thick enough) ally ring to get a derailleur chain on - bugger that. A 2mm SS 80tooth ring to go on a 130mm PCD 5 bolt spider weighs 375g & is strong enough to look after itself

 

[recumpence]

Matt could you some made up and sell them with your kit

That is fine up to 60 teeth. 80 teeth is pretty large and hangs down low.

The OP is looking for a 80 tooth chainring to mount to the rear wheel. It is needed because of the large 26 inch rear wheel he is running with a relatively high RPM motor.

Matt

 

[MitchJi]

Hi,

Matt could you some made up and sell them with your kit

That is fine up to 60 teeth. 80 teeth is pretty large and hangs down low.

The OP is looking for a 80 tooth chainring to mount to the rear wheel. It is needed because of the large 26 inch rear wheel he is running with a relatively high RPM motor.

It might be cheaper for the OP to have the machining done attach a small #219 sprocket to his drive FW and use a 72t-92t Extron sprocket for $21.49 . Would also work well as a motor driven chain ring.

Extron Pro 219 Axle Sprocket

Extron Pro 219 Sprockets are 40% lighter than anything on the market today. Made of Kevlar, these sprockets are stronger, quieter, more durable, and feature less sliding resistance (keeping the sprocket cooler, thereby increasing chain life) than either aluminum or composite sprockets.

 

[mrbill]

I've been searching for weeks for a cheaper alternative than greenspeed chainrings, at $250, they're not cheap.

I've also followed the CNC route, which is cheap if you know the right people, but 'front door' prices are around £250-350. The actual material cost is around £10. Cheapest I found was £100 excluding materials, by winning a friendly team on-side. Still pricey.


As I'm based in the UK it's cheaper to import from Europe ...

T

Last year I had Andrew at Kings Sales and Service (http://kingssalesandservice.com) make me up a couple of large chainrings (7075 Aluminum, 110BCD mounting) for about 50 cents/tooth (ANSI #25). He did beautiful work.

Even with shipping and import tax, you ought to do better than the prices you mentioned.

This photo shows the 120t ring:
http://mrbill.homeip.net/albums/power_gold_rush_build/pages/page_85.html