Used to frequent this store years ago. Then went with Hubway/Blue Bikes for a decade. Now have my own bike again. Needed a new chain, old one felt worn and loose, measurement confirmed it was. Now, I have a Shimano internally geared drivetrain. It looks they choose to install a (1/2 x) 1/8th KMC chain. This is something one can question - the situation seems to be this: multi (derailleur) gear drivetrains, like 6, 7 or 8 speed drivetrains use a 3/32th chain - single speed bikes often use a beefier 1/8th drivetrain with thicker sprockets/chainwheels. Now, Shimano uses 3/32th sprockets for their internally geared hubs. Now, one could pair a 1/8th chainwheel designed for single speed or one of those stylish BMX chainwheels to pair it, that are thicker 1/8th. If one does that, one wants to use a 1/8th chain. However, my bike, like most that was designed for internally geared Shimano hubs, uses a regular 3/32th wide chainwheel that would be compatible with derailleur geared setups as well - Shimano designed it that way, probably to make logistics simple, makes sense to me - go Shimano. Now, why it was decided to install a 1/8th chain - no idea. Reading up says one can install a 1/8th chain on a 3/32th sprocket/chainwheel setup. One can expect a little more wear over the long run on chainwheel and sprocket as it doesn't fit as well in width, maybe also slightly more "noise" (not a problem - if there is, nothing I'd notice) etc.. Ok, so maybe not optimal and I'd expect a store like this to put a "proper" chain on it - it's not that difficult, is it? I suspect money might be a reason, the KMC 1/8th chain is inexpensive, goes for 5.99 on the KMC website, whereas 3/32th chain seem a bit more expensive, maybe because they are longer as they usually come for derailleur setups. I paid the same price ($25 for chain plus approx $20 for installing it) though as a derailleur bike would have been. All of this - may that be as it is, wouldn't necessarily have been a big deal.
BUT there was a problem - they didn't use the right "magic"/"missing" link to join/close the chain. I had constant trouble, the chain dropped frequently, originally maybe once a month/3-weeks. I went back to the store and reported - this didn't happen before. They blamed "maybe" the control wire or housing needed replacement causing this. I asked how would that possible have an such an effect? blahblah...
7 month later the chain broke - and it was not the chain itself, it was the missing link - and it broke as in the rivetted axle part broke out of the side piece - it was not that the link came apart at the removable/undone-able side, the link was destroyed. I went back to the store to buy another link as I figured the chain itself seems ok - if I just replace the link I should be good. So I went in and the associated said they don't carry missing links for KMC 1/8th chains. I stated but I had this done here. He responded yes, they sometimes use KMC 1/8th chain, but they don't carry the KMC (or any generic) 1/8th "missing link" joining thing. So I had to buzz off without accomplishing my goal - but I wondered - how is this possible/ They install a chain on my bike that they say they don't have the proper joining thingee for. So I walked to the next bike store (Bike Boom). I went in and asked for a KMC 1/8th missing link - and they had it. Looked completely different from the one that was on my chain. The pin length was different as well - when you take a half of the magic link I had and the double pin portion of the "missing link" and hold them together. I went back into the store and asked - are you sure this is right - this looks completely different from what I had. i had the chain in my bike basked outside the store. The associate came out with me, looked at what I had and said - you have a multi-speed (derailleur) 3/32th link on your chain - that is not the right one. The one I gave you is the right one!
Turns out he was right. I installed the chain with the new link he had given me - and all the problems I had before seem to have disappeared. No chain drops anymore. No funny noises/"klonck"s. No (extreme) sensitivity of chain tension apparently related to chain drops anymore - now apparently trouble free operation. This also explains why the link failed and the way it failed and the answer of the attended of not having such a link. So they use the chain and then use a different link for different chain types that kind of initially kind of fits as in it seems to join the chain together, but then causes a lot of operational trouble and prematurely fails. The combined time I wasted with dealing with these failures like chain drops over this 7 month period is probably a day's worth - including the time I went back to the store and reported that something doesn't seem right; I now frequently have problems I didn't have before. To get a bullshit answer and would have incurred additional cost for "bogus" follow ups if I had gone for it. read more