First single speed project - help!

hippy [quote]jashburnham Yeah the fixed sprocket is on 17 and I was advised to leave that as is, but for the freewheel I'd like a bit more grunt! My commute is on fairly straight roads and they are never that busy - hence not much weaving/bobbing required. I'll also be training in RP which is a pretty straight shot for me, plus early morning = less traffic. What sort of speed/rpm will I get from a 48x16 or 48x15? I'm struggling to get a feel for this given I'm so used to having a compact 54/30 x 11/25. I reckon on the road bikes my favourite combo is 54x15, I reckon that gives me 87.6 gear inches, whereas the 48x17 gives me 74.2. So a 48x15 would give me 84.1 which sounds better. I'm not very technical, but am I along the right lines here - or totally wrong?

I guess it depends what you are after? 54x15 for me would be a frickin' TT gear! Do you have any idea what you avg. cadence is now?
When you get to a 'normal' bit of your ride, count your pedal going over for 10sec and multiply it by 6. 100rpm is a nice, cruisin' cadence.
If you're a sprinter you'll wanna be spinning faster. If you're a TT'er you'll want a bit lower (this is a GENERALISATION btw but works for most people)

If I were you then, I'd buy a few £10 cogs from On-One and test out different ratios. If you're really not happy spinning then up your gear. Try a 15T.
Is it 3/32 or 1/8th setup?[/quote]

I guess it depends what you are after? 54x15 for me would be a frickin' TT gear! Do you have any idea what you avg. cadence is now?
When you get to a 'normal' bit of your ride, count your pedal going over for 10sec and multiply it by 6. 100rpm is a nice, cruisin' cadence.
If you're a sprinter you'll wanna be spinning faster. If you're a TT'er you'll want a bit lower (this is a GENERALISATION btw but works for most people)

If I were you then, I'd buy a few £10 cogs from On-One and test out different ratios. If you're really not happy spinning then up your gear. Try a 15T.
Is it 3/32 or 1/8th setup?[/quote]

It's a 1/8th. Reckon I'm gonna go for the 15T.