4 Gear inches-significant difference?

Quick question people...

I need a new cog for my Pompino. I'm currently running 48x18 giving me 70GI on 23c tyres. I mainly commute on my bike from Dartford to Woolwich, which is a bit hilly in places, but I can get over them all (just). I was thinking of taking the opportinity to raise my gearing by going for a 17t cog. Will the 4GI difference be noticable or do you reckon I should go for a 16t for 8GI more?

TIA

Peace

Kurt

You commute to Woolwich! Bad luck I commute aways from it as often as possible.

I find I notice one tooth difference. Think of it like on a geared bike . You feel the difference when changing just one gear don't you?

keep it, spin to win!

Bloody hell, that was quick! Good point re gearing and Yeah!... Woolwich is great. I work as a EMT (like a paramedic) at the ambo station by the ferry, so I get to go out to other nice places like Thamesmead too, and get vomited on and abused by drunks mainly!If it wasn't for the proper jobs I'd jack it tomorrow.

Peace

Kurt

Spin to win. I run 66" and ride all over. It's better for fitness, strength and your knees, too...

I run 47 18 for round town. Stick with what you got

47 16 to win

you will notice but can probably handle a double change. I moved from 42-16 to 46-16 with a 14 for time trials. Not sure how much change the 46-16 is from a 42-16 (cant be bothered to Sheldon it) but its a comfortable change without overdoing it. Any more would probably be too much in one step. I also have a 43-16 on another bike and there is a difference in feel between that and the 42-16, if minor.

Easy solution - but both cogs and make em cheap ones,a ddnig them to the collection

Not sure how much change the 46-16 is from a 42-16 (cant be bothered to Sheldon it)
about 7GI

46x17
44x17
48x19
42x16
45x17
are all good, hippy-tested London gear options. 4GI is quite noticeable to me.

53x15 legend

I recently changed from 48x17 (74 gear inches) to 48x19 (64 inches or close). I much prefer it. My average speed hasn't dropped, but my cadence is up and I can stop a lot better.

48:17 to 48:19 is a massive change, IMO - i have ridden both those gears.

i'm thinking of giving 48:17 another go, currently on 18

I ride 48:16 and 48:15 on one of my bikes, and it is a real grind. Need to find a new cog

kurt, i currently run 48:17 and i'm about to change to 48:18. i anticipate it being quite noticeable.

i'm currently riding 43:16 but want to switch to 43:17 - knees hurting and i noticed the difference a lot since my last combo of 39:16. yes, GI matter!

Ive ran around 76GI for the city, and have had to go up a long uphill on daily basis.

Its all doable, and felt super fast compared to any of my other bikes.

But whenever ive ridden with other people, they have been able to thrash me speedwise even on a lower gear even downhills.

This made me realise im quite unfit, and could really do with learning how to move my legs faster. Think it would feel a lot better and improve cardio-vascular stuff innit.

Im going to drop down to around 70 for my new bike.

Oh and Kurt, maximum respect! for being a paramedic. Id suck at that.

yeah, if you drop down, you soon get used to spinning, then you'll be faster.

to increase GI because you perceive your current ratio isn't "fast" enough is the wrong thing to do.

if you want to go faster, pedal faster. or get gears.

or take EPO