just posted this in bmx racing, so did it here too.

sent this email to jw. has anyone ever had any problems with jw chainwheels?
email...
Seems when the chainwheel has tension on the chain there is a small bit of play during putting pressure on the down stroke of the pedals. I can see the chainwheel move slightly forward in the chain. Thought it was my cassette, but let a few friends look at it, described the problem, and they confirmed. The chainwheel moves slightly forward in the chain. Im running a drop buster 3/32 chain. Have checked my chain and others with a micrometer to measure the size of the barrels of the chain(the part that sits in the teeth, and they are all the same. So to check it again I put lots of tension on the chain, using chain tensioners, and the problem is very evident.

Seems the chainwheel teeth are not spaced correctly, or the barrels of the chain don’t give a tight fit, which leads to the chainwheel moving slightly forward inside the chain. Have you ever heard of this happening to others? What do you suggest to remedy this problem? Is this a flaw in the design?

Please respond to this email ASAP to let me know what you think and your response to my questions/concerns.

It sounds to me like your chain might have stretched a bit. I've never had a problem with JW chainrings. They have always been perfect.

I just rode my 125R at the skatepark today with my 44T J&W. NOT A SINGLE ISSUE and smooth as butter with my sram chain. I have alot of J&W PRODUCTS. very high end stuff..

I got mine 2nd hand, but like new and its 100% true. Just took a brand new profile imperial out of the package for a buddys bike, and its bent and its package fresh...

Those things are pure garbage. I went through three of them last season when I was running flights and couldn't find a good one.

this is exactly what i'm thinking too
i have never done this, as most don't, but it is highly recommended to put on a new chain whenever you put on a new front sprocket, i'm not honestly sure how this relates to cogs and freewheels

i do know of several people that have chains specific to each different gear they run, so that way whenever they change gearing for whatever reason they always have the same chain on that goes with any certain gear so there is never a question of one or the other being "worn" differently
this way they will always be mated to each other... follow me



i know what your saying completely, but i have some newer ones that are great as well as some others that are really old that are great that i won't part with because i remember getting some bad ones years ago

i just wish they'd make some 19mm specific ones to fit their spindles, those damn hat washers suck

talked to a few people who mentioned chains not being compatable with certain gears. stretching chains???
gonna try a new one...

thanks

Hey Joel, go to their website, they do make them with 19mm bores.

no kidding?
man, do i feel like a newb

Check it out here!

oh ya, i knew jw made 19mm specific, top notch gears

i was refering to profile though, they don't though... correct? just the .875" bore?

Ooops, didn't catch the "Profile " part. LOL!