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Discussion Starter #1
i purchased a new chain and set of sprockets from a local shop.

the sprockets are from pbi, front is a 15t chromoly steel, what has me concerned is the rear, which is 39t 7062 aluminum. the new chain is a DID 520vm x 110l (is this the correct chain?)

before starting to put the parts on i want to know if the aluminum rear is a good idea, and anything else that i should be careful of while installing.
 

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i do know the tq from the rappy will eat up the aluminum rear in a year
And that is a very optimistic assertion :) I installed aluminium sprockets at the beginning of summer and they are toast now. A little over 1000 miles done with them.
 

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Discussion Starter #4
will the bike eat through all grades of alum just as bad, or are higher grade sprockets safer

this sprocket is

"manufactured from aircraft quality 7075 T651 plate aluminum"

lol

"harder than steel and far lighter to save on unsprung weight"

direct package quote
 

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will the bike eat through all grades of alum just as bad, or are higher grade sprockets safer

this sprocket is

"manufactured from aircraft quality 7075 T651 plate aluminum"

lol

"harder than steel and far lighter to save on unsprung weight"

direct package quote
Hardness and resistance to wear are two things unfortunately. IMHO alum is good for non-moving parts. I'm sure different grades will wear differently, but it's still a soft metal..
 

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Discussion Starter #6
Hardness and resistance to wear are two things unfortunately. IMHO alum is good for non-moving parts. I'm sure different grades will wear differently, but it's still a soft metal..
what grade of aluminum were your sprockets constructed from if you dont mind me asking
 

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Most rear sprockets are 7075, including the renthal one I have on the wall. Depends on how much you ride, and how attentive you are to proper chain tension but yes they will wear out somewhere between 1/4 and 1/2 the time of a steel sprocket. Hold the two in your hand though and you can feel the difference in weight.
 

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And that is a very optimistic assertion :) I installed aluminium sprockets at the beginning of summer and they are toast now. A little over 1000 miles done with them.
Just going by how long a buddies lasted, of course its about how much you ride, 1000miles thats a decent number:D
 

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i have a gytr rear aluminum sprocket, i put it on with a new chain over the winter, havent really rode much due to the snow, but ill keep tabs on it to see what i get out of it
 

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Just going by how long a buddies lasted, of course its about how much you ride, 1000miles thats a decent number:D
1000 miles isn't much for me, I usually rack up 7000 miles a year or so. With spring and autumn downtimes because of shitty weather, it means I have to change chain/sprockets every month if I go alum. That's just terrible considering my stock setup lasted a year in the same conditions.

And to the OP I have no idea what grade they were. The brand is "PrimaryDrive". Worse crap I ever put on my bike.
 

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1000 miles isn't much for me, I usually rack up 7000 miles a year or so. With spring and autumn downtimes because of shitty weather, it means I have to change chain/sprockets every month if I go alum. That's just terrible considering my stock setup lasted a year in the same conditions.

And to the OP I have no idea what grade they were. The brand is "PrimaryDrive". Worse crap I ever put on my bike.
To the op just go with steel you'll be good i have renthal on mine. Qc, yeah those sound horrible:wow: when i ride i do 50 to 75 miles @ at a time and all year long so i put up some good numbers myself;)
 

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Discussion Starter #13 (Edited)
well im going to eat up this alum pbi rear ill keep you guys posted on how many hours i get out of it.

is there an online guide to installing a new chain? quick search gave me nothin

should the rear axle be set back to original position because of tightening the old chain, and what is the best way to remove links when you are getting the new chain down to the right length

edit: is there a set number of links to remove from a 110L chain
 

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well im going to eat up this alum pbi rear ill keep you guys posted on how many hours i get out of it.

is there an online guide to installing a new chain? quick search gave me nothin

should the rear axle be set back to original position because of tightening the old chain, and what is the best way to remove links when you are getting the new chain down to the right length

edit: is there a set number of links to remove from a 110L chain
There's a manual on the site you can download itll tell you how to do it
 

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Discussion Starter #17
since i have gone up in size on the front and rear sprockets it seems like 98 is not the number that i need.

i discovered this after cutting the new chain to 98, is this chain garbage or can i make it work somehow.
 

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The only fix would be to add a second master link, I'm not particularly a fan of this method but I have run it and it will work. You just have 2 points in the chain now instead of one, though the master link itself is often considered the weak point of the chain.

That's a 100 dollar + chain, so I would understand if you didn't want to just chuck it in the garbage.
 
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