JeremyZ

I just bought a Gary Fisher Simple City 3. It has a 3-speed Shimano Nexus internal geared hub. I was rather hoping the low gear would be low enough to climb hills. But it isn't, at least not for me.

On the other end, the top gear is more than tall enough for my needs. So I'm thinking about gearing down a bit to make 1st into a hill climbing gear.

How do I go about this? Where can I order sprockets & chains? (I assume I'd need to change the chain too, since there's no derailleur to pick up the slack from a smaller front sprocket.

CACycling

Are you planning to put a larger cog on the rear or a smaller chain ring on the front? If you go with a smaller chain ring, you won't need a new chain but you might need to remove a link or two depending on how much smaller you go. A larger cog on the rear may or may not need a new chain depending on how much larger you go and how much adjustment you currently have.

Mr IGH

If you want to DIY, Jenson, Harris and Universal have IGH sprockets, here's a couple of good websites for info/instructions:
https://bike.shimano.com/publish/cont...tech_tips.html

https://techdocs.shimano.com/techdocs...=1209642127490

JeremyZ

I'd probably go smaller on the front, so as not to have to mess with the IGH. Maybe just small enough to take out a few links. Bike chains don't still have master links, do they?

CACycling

Some chains have master links, some don't. Regardless, you'll need a chain tool to remove links.

Mauriceloridans

The rear sprocket is not hard to change and you may have trouble finding a smaller chainring. I looked at your link and couldn't find the info on the crankset like BCD and bolt pattern which you need to find a chainring. Here's your current gearing in gear inches: 48.4/ 66/90.

I'd look for a 22 T rear cog for Low - High
39.6
54.0
73.7

buck mulligan

I don't know about the Shimano, but I know that changing out the rear cog on my SA was dead easy - much easier than fiddling with the chainring would have been, and cheaper, too. I needed a new chain because I had almost no wiggle room in my dropouts - total cost, cog and chain, about $15.

Jeff Wills

+1. It's far easier to change the sprocket on a internal gear hub. The hardest part is removing the rear wheel. I'd talk to a bike shop if you need a longer chain. They might have extra links to lengthen you chain.

Mr IGH

It's the same size sprocket/lockring, interchangable.