serge

I'd like to replace the stock rear sprocket (1950 raleigh sports) for something begger 21 or 22 tooth? Will that work with a full chaincase or will it interfere? Do I need to get a new chain?

Thanks

jcm

I've heard that a 22 will work. A really good source is cudak888. He hangs out over in Vintage. Another source is Lord Sheldon Brown.

serge

Thanks JCM. I did post over at vintage first , but received no advice.

Serge

grolby

There should be enough space to adjust the axle in the dropouts to make a new chain unnecessary. I would try and make it work without buying a new chain first - you can pick one up if necessary. Cog width doesn't really matter, since the bike has a 1/8" chain. You should get a 1/8" cog just as a matter of principle, but it's no big deal if you can only find it in 3/32".

serge

Thanks Grolby,

I found a used SA 22 tooth cog today & should have it via mail in a few days. I was going to have the LBS switch it, but maybe I'll attempt to install it myself

Thanks for the advice on the chain, I'll use the original as you suggested.

spider-man

The cogs are simple to install. Pry off the retainer clip, remove spacer and old cog. Reverse using new cog.

Be aware which way the old cog is positioned. They can be reversed to adjust chainline.

serge

Thanks spider-man,

Sounds easy. It appears, the chaincase is the main obstacle

San Rensho 

I have a 46/22 on my bike and it works great. It gives a fairly low 1st gear which makes it easy to accelerate from a stop. 2nd is my default gear, easy to spin and actually pretty fast and 3rd gear is around a 75 in. gear, which if I get spinning, I can go easily over 25 mph for short bursts.

San Rensho 

By the way, sweet bike. What is it?

serge

Hi San Rensho,

Sounds what I need, as tend to use 1st as my default now. I think the dynohub & the overall weight of the bike makes it slow of the start. I have an newer ('62) lighter Puch 3 speed which has the same gearing & I tend to use 2nd as my default.

Do you have the enclosed chaincase on your?

serge

An all original 1950 Raleigh Sports with dynohub. A very smooth ride

San Rensho 

I've got a 71 Dunelt. No chaincase, though. I thought Raliegh's with chaincases weren't imported to the US, could be wrong.

serge

Yes I'm unclear on that myself. From what I've read some probably were, although not as many & probably the chaincases were more common on 50's vintage bikes? Just a guess based on what I've seen floating around. When I bought my bike they also had a 59 Phillips Manhattan with a chaincase + a bunch of older cool looking bikes with them, unfortunately they were all ladies bikes, apart from the Phillips.