TOPIC:

It's a helluva lot better than $400 for sprocket! I'm just curious if PMFR's price is worth the product over the D&G part...

T_Dub wrote:

If they weld it before they machine it then there will be no difference.

As far as runout is concerned, I agreee. However, as far as, material composition, ultimate strength, and hardness is concerned, I beg to differ. High carbon alloy steel has a tendancy to harden and become brittle when welded. Proper pre and post heat cycles have to be correctly followed to prevent hardening in the heat affected zone. There is no substitute for a part machined from a solid billet when strength is concerned. With that said, for your application, I think that the welded spocket is fine. If you had stated a goal of running high 8's with a turbocharged big block bike, then I would say to go with the PMFR sprocket. By the way, $400 is a fair price for a sprocket machined from a solid piece, and then heat treated, on what amounts to a one-off basis. Btw, I just paid $90 shipped for a 1/2" offset, 18 tooth, 530 sprocket from American Classix. $125 doesn't sound too bad considering that you need a custom offset.

You're right of course, I was responding to his comment on runout etc. All the same, if the other place heat treats after welding, you could have close tot he same properties. I do a lot of thinking about welding, one of the biggest considerations in mechanical design(I'm a mechanical engineer).

Your paint scheme sounds great.
I ordered a 530 19 5/8" offset , with a bearing support nose, from D&G last week $96. the total was 135, including a bearing($12) and shipping($27). they make them with large 3"offsets for big tire bikes. i dont know how big they go. if they are strong enough for these big tire bikes, there definitely wont be any trouble handling our bikes output.
They have been making these for a long time, they specialize in big power bikes.
What size are u needing?

You know mark, I was thinking I would need about 1.25" of offset. BUT, I got to thinking about it, and there is no way I would need that much offset. I only widened the frame 1.5", and I didn't widen it THAT asymmetricaly. I need to actually bolt on the stock counter sprocket and take a measurement. I might be able to get away with an off the shelf part
Incidentally Mark, did you pick up one of irishwills o.b. supports? Have you gotten it yet?

Yes u def need to get a stock counter sprocket on there, and put a straight edge across the rear sprocket to the front one.
it will all depend on the rear. most guys get away with 1/2" offset, but your swing arm is not like most guys.
I could have used 1 1/4" as well but i chose to mill the rear hub/carrier instead. this allowed me to use the 5/8" offset, but forced me to use a thinner 170 tire. this was due to the chain being closer to the tire now.
I did get a support plate from Ben. I have it and it looks great. i need to pick up some tubing to make the spaces for it. once the sprocket and bearing arrive, i can have a look at it. I also have a ZRX hydro clutch for it, but i have been too cheep to buy a nice matching hose for it.it needs to be about 10 miles long. i have the carbon look brake lines, with gold fittings.it is always on the bottom of my to do list.
I just have no time for the bike right now, as i have Bought a duplex for a rental investment. it needs a lot of work, so i am tide up with that right now.

OK, I bolted the counter shaft sprocket in place, lined a laser up on the rear sprocket centerline and measured off the face off the counter sprocket. taking into account 1/2 the thickness of the stock sprocket, I have a centerline to centerline offset of .9225" Now, the closest off the shelf offset sprocket is 7/8" or .875" - a difference of .0475". My question is this: Is .0475" an acceptable amount of miss alignment or should I order a custom sprocket for a more exact alignment? That equates to approx 1/23"

Adam, I wouldn't worry about 0.0475". When I was measuring for my sprockets, my countershaft sprocket had at least that much runout. Get a 7/8" and be done. What size tire is on that Triumph wheel? I guess that the wheel is slightly off center on the stock Triumph.

Thanks Josh, as soon as I looked at the figure of 1/23" miss alignment, figured I'd probably be ok. The Triumph wheel is 5.5" wide with a 180 55/17

In my exhausted stuper, I have been messing around with my rearsets, which are '05 R6 units. I have been trying to find a way to utilize at least one of the stock mounting points. I began by modifying 2 of the 4 original footrest mounting pegs. The original is on the left, the modified one on the right. I shortened the 10mm side to eliminate the stud sticking out on the other side (clearance issues with the swingarm), turned the o.d. down to fit inside the rearset mounting hole and shorted the 8mm sud end.

So with one mounting stud in the original upper location and the rearset in approximately the stock R6 orientation, I'll have to fabricate the bottom rearset mount below the frame tube and behind the lower frame mount. You can visualize it in this pic

As a comparison, I held the stock peg up to show the difference of the rearset location. The rearset is raised up slightly over the stocker (less than 1/2") and is set back 8" from stock.