Spokets.....bit long winded

[BoltonSte]

OK, here's a question for the pool of knowledge that is sv650.0org, I think I know the answer but I want a check as my physics is rusty.

1.) A std sv has front and rear sprockets with a certain number of teeth, just for argument 16/32, giving you the ratio 1:2, because the wheel is a fixed size, 17" and the front sproket does not change then I can adjust this ratio simply by changing the number of teeth on the rear as this is also related to sprocket diameter.

2.) I've seen people talking about putting gixxer rears on, sooooo, I put an R1 rear on, the wheel is still 17", but the sprockets are 18/42. If I now want to keep the same grunt from the orig. SV, I can no longer put a 32 tooth R1 sproket onto the wheel but rather I need to find an R1 sproket that has the correct number of teeth to give it the same diameter as the orig. off the bike?

Or are all sprokets of a given tooth size the same dimeter as the teeth are fixed size?

am I thinking along the correct lines?

Just re-read this looks like an exam....lol

All numbers are made up just for my ease as I don't like decimals.

ste

The SV650N has a 15 tooth front & a 45 tooth rear... The SV650S has a 15 tooth front & a 44 tooth rear - Yes you can change the ratio by just changing the rear sprocket, in fact, just changing the rear is probably better than reducing the size of the front sprocket as this increases wear on the chain quite substantially...

The sprocket sizes increases in diameter with the increasing number of teeth added, this is why you need a chain with more links in it to compensate for the extra size of the sprockets... (e.g. I want to put a 47 tooth sprocket on the rear of my bike, to do this I need a 110 link chain, as opposed to the 108 link standard chain I have fitted at the moment...)

TBH I dunno whether this answers your point or not, this is just my 2 peneth

[embee]

Ermm

I think you've got it.

There are 2 basic issues.

1 - the "tooth size" you refer to is in essence the designation of the chain type, for example 520, 525, 530 etc. This is the distance between the chain link pins and the width of the chain rollers (or in effect the thickness of the sprocket). The other things like roller diameter are industry standards associated with that chain designation.

2 - You can have however many teeth you want in theory, limited only by a minimum practical size for decent chain life, and what is commercially available. For a 520/525 chain 14T is really the absolute minimum for a decent life, 15T is better.

An additional practical issue is what length chain you need for your chosen sprockets on your chosen bike, clearances etc.

I think what you're aiming at is the question of overall gearing. As far as the sprockets are concerned, just divide one by the other and you get the ratio (e.g. 45/15 = 3.0:1 , 44/15 = 2.9333:1 , 47/16 = 2.9375:1 in other words you'll hardly tell the difference between 44/15 and 47/16)

Originally Posted by Cloggsy

(e.g. I want to put a 47 tooth sprocket on the rear of my bike, to do this I need a 110 link chain, as opposed to the 108 link standard chain I have fitted at the moment...)

Just as a side issue, you will need a slightly longer chain than that Cloggs. Wouldn't wanna see you getting one which is on the small side. Bear in mind that as well as the extra space on the actual sprocket, the whole chain run will be longer, because the diameter of the rear sprocket is bigger, and most rearward point from the front sprocket is further with a bigger sprocket. I think the length I used in the end was about a 114, but don't quote me on that. Best to be sure, do what I did, get a long one sent (118 link), and cut it down to length.

Dan.

[BoltonSte]

Cheers fella's, I had forgot bout the chain size ie. 520 etc....

sorted

ste

whats a spocket ?

Originally Posted by bikageboy

whats a spocket ?