Chains 101

[ejcycles]

Ok Guys here goes The 520 Conversion.

Front sprocket 15T, Rear Sprocket 40T, 130 Links of D.I.D. Chain for a 2.67 final gear ratio...$101.38 plus tax & shipping, etc.

Front sprocket 15T, Rear Sprocket 41T, 130 Links of D.I.D. Chain for a 2.73 final gear ratio...$101.38 plus tax & shipping, etc.

The 428 set-up with 17 & 46 sprockets has a final ratio of 2.71, with this ratio the bikes will do 70mph.

[ejcycles]

Hi Guys
Well if you think the prices are to high then subtract the D.I.D. chain, {$53.30} and put a cheaper one on. The front & rear sprockets are both steel and made by JT Sprockets. This is the only company that makes the front {15 only} & rear in many sizes. Sprocket Specialists has them but Ouch are they High Priced!

[cycleway4]

Hi Bruce.....Its probably been covered here, and I havent run across it yet,....but what is the interchangeability between the more popular brands as far as chain and front/rear sprockets?
I would assume? the fronts are the same, seeing as most use the same engines,...but how about the rear?
I guess in particular,......the Roketa and Lifan?

and are most of the electrics the same?...CDI,...rectifier,....coil,....things like that.........

thanks!
Steve

[liverchip]

Yeah same for me. My bike is virtually identical to a DB27 or RDJ-200. Did I say virtually...ever mind... it's the same bloody bike. Any chance that you can get brake pads for these babies, as well as the sprocket conversion?

[red2003]

Hey Bruce, do you have that DID 428 chain in stock? I think I'll ditch the stocker before I even put the bike back on the street this Spring. If you do, can you pm me a price shipped to 05680. Thanks a bunch,

Steve.

[ejcycles]

Hi All

red2003, I PMed you yes I do have 428 in stock.

liverchip & cycleway4,

I don't know all of the cross referenced parts for these bikes as I only sell American Lifan. Each and every time someone comes to me and wants a part I have to figure what it may cross to compared to A. Lifan. Chain & sprockets are interchangeable with aftermarket parts. No I'm not giving out the 520 conversion numbers, as there are 17 different sprockets that could have worked and I have over Four hours in figuring it all out for sizes & ratio's. The rear wheels might be the same but might not be as not all of them come from the same manufacturer. Electronics I could not be positive about either because they don't all use the same manufacturer. There are some parts that will interchange with the Big 4 and some that will not.

[Ferrit]

Hey Bruce!

I'm ready to order a chain and sprocket conversion for my roketa DB-07A in the 2.73 gearing. What's the nuts and bolts of it? How do I pay ya, etc?

thanks in advance,
G.

[katoranger]

I put 6000 miles on a bikemaster brand 428H chain that was 16.99.

The chain has elongated to the point that the sprocket teeth of almost worn off. I barely made it home last night.

Allen

[dieselhead]

Heres a chart with some good specs
http://www.didchain.com/specs.htm

[dieselhead]

Something that should be a consideration in buying chain is the fact that a X-ring chain WILL slow you down. I did the 520 conversion with a RK 520XOS chain and the resistance of all those rubber rings slowed my bike a full 3-4 mph (50MPH) on a power testing hill. After about 80 miles, the chain was still holding the bike back. The stock 428 chain weighed 2.8 lbs. The RK with heavy plates and wider pins (for the X rings) wieghted 3.5 lbs. The fix was a EK 520MRDL6 (NON O-ring) Light Wieght motocross racing chain. This chain was loose as a goose right out of the wrapper and weighted in at 2.75 lbs in the same length as the others. Results on the hill showed me back up to my 54 mph speed of the 428 chain. IMHO, if you want the optimum performance and economy from these entry level 200's, stay away from the rings!! It DOES make a difference.

[TheRealWorld]

I have been researching chain and came across this info and found it interesting. I could not figure out what kind of chain I had, but now I know.

Construction and Features

Motorcycle Chains have the same basic construction and sizes (numbers 40, 50, and 60, Table 1.9) as Standard Roller Chains. But they have a special width of inner links. Because of the very demanding working conditions, some Motorcycle Chains have the following special features:

1. Strength
Quad-staked riveting on the pin head helps to retain the link plate on the pin. Connecting links are press fit. (Riveted connecting links are also available.) Link plates are thicker (heavy) and the rollers are seamless.
2. Wear life
Special coated pins, sintered bushings that are oil impregnated, and seamless bushings with O-rings are used to extend the wear life of the chain.
3. Resistance to dirt, sand, or mud
To prevent debris from getting into tight joints, the bushings are extended beyond the inner link plates, and often O-rings are used to seal the chains. This extension and O-rings prevent abrasive material from getting into the chain.
4. Appearance
These chains may have special coloring, plating, (gold or silver), or glossy finish on the plates.

Table 1.9 Motorcycle Chains 40 Class 50 Class 60 Class
Chain Number Inside Width (mm) Chain Number Inside Width (mm) Chain Number Inside Width (mm)
420 6.35 520 6.35 630 9.53
425 7.95* 525 7.95
428** 7.95* 530 9.53*

* Same inside width as ANSI Standard Roller Chain
** Roller diameter differs from ANSI Standard Roller Chain

Sprockets

Special sprockets are used for these chains. Numbers 425 and 530 sprockets have the same tooth shapes as standard types.

[bechandler07]

i keep reading all the info on here and i am really needing to upgrade my bike . i bought it from tom at rpm in 2007 (hi-bird gy200) . tom put a 46 tooth sprocket on the rear of the bike which has made it good for 65-68 mph on the open highway and getting about 100 miles (or better ) to a tank of fuel . my problem is that my chain keeps popping off if the clutch is let out too quick of if i brake too hard . my only problem i can see is that i am missing a bolt where the engine mounts to the frame right by the swingarm . i am needeing a new chain anyway so i am looking at a set maybe from an xr250 or something like that ? has anybody had a problem with this or is there a better application for all 3

[frostbite]

Talk about resurrecting the dead (thread that is). I'm chain shopping and came across this site regarding tensile strength.

http://sidewindersprockets.com/tensile.html

[culcune]

Originally Posted by frostbite

Talk about resurrecting the dead (thread that is). I'm chain shopping and came across this site regarding tensile strength.

http://sidewindersprockets.com/tensile.html

I thought you were banned!

All kidding aside--good to 'see' you on here again!!

[culcune]

Oh, and thanks for the link--they seem to be on the up and up and even mentioned having sprockets for Chinese bikes!