What's the bcd for Giant Expressway 2 chainring?
 

Hi all, can anyone please verify the bcd for Giant Expressway 2 chainrings? I have a customer who needs a replacement, I don't have the bike available and am trying to research this before he returns from travel.

I think it is 130mm but would appreciate a sanity check...and any leads on where to purchase one that has the integrated guard like stock does.

Thank you!

Pete

Pete, have you dealt with Giant parts before? Only reason I ask - they tend not to stock proprietary parts for very long. I had a friend who had a Giant Halfway folder that he needed some parts for, and he was told by Giant they no longer stocked or sourced them. The LBS where I hang out is a Giant dealer and confirms that parts availability is somewhere between scarce and non-existent, especially on older-model low production bikes like folders and recumbents.

Your best bet is to contact Giant directly, or a Giant dealer, and see if they can help you, if you need something like their proprietary chainguard. If it's not a wonky BCD, you might be able to replace just the chainring, but it is not an elegant fix.

I've not dealt with many folding bikes, no! If memory serves it's a standard bcd I just can't remember what that bcd was....... and I have successfully lost the paper I had it written down on :innocent::twitchy:

I found a chainring for Brompton's new version cranks which are a standard 130mm bcd -- which I think the ExpressWay is as well -- and DOES have the guard -- but need to verify before ordering and hoping to not have to sit on hold with Giant.

if it is 130 and u need 53 or 56 give me shout , glad to help
thor

Cheers Thor, thanks for that

Un-scientifically looking at web pictures of Expressways, looks like 110bcd to me...with a plastic pants guard that screws onto the chainring.. might have to cobb something together if you want an OEM look ..


http://i181.photobucket.com/albums/x...psmdppg4tj.jpg

Agree with Bruce, likely 110bcd. I went through this, it means upgrading the crankset to 130bcd in order to get a ring larger than ~52t. I went to 56t, and glad I did.

Upgrading the crankset is NOT entirely a bad thing, except for the additional wallet emptying.

actually that's not a bad idea. Not because I sell a complete crank with 53 teeth and alloy chainguard. The whole thing is under 900 grams and that's with much much better bottom bracket. Cost is very reasonable
Similar ones are available in many places. And it looks that the OP is a bike shop, he might have something similar around..... might have to switch chainrings ...


Usually manufacturers try to save a buck or two on the bottom bracket and that makes it heavy and maybe not quite as smooth than a better one. I like those Giant folding bikes, and it might be worthwhile to upgrade a little bit.

Cannot measure sanity with a ruler , but you can use one to measure the bolt circle spacing.

Sheldon Brown's Bicycle Crank/Chainring Bolt Circle Diameter Crib Sheet

Thanks all. We're a small pop-up repair outfit in DC and interestingly don't get many folding bikes in the door. This particular customer is unwilling to invest much money in to parts or repair so unlikely I can convince them to replace entire crankset/bb/rings. Thank you all again for your inputs!