Quick rear derailleur question :-)

[Ajax Bay]

you don't want to be moving forward 5 inches for each pedal revolution and only going at 1 mph

1 mph = about 18" a second. Climbing a hill really really slowly your cadence would not be above 60rpm so one revolution of the cranks a second for that 18".
Gear calculator for 48-36-26, 11-34 and cadence of 90 on 700c wheels with 32mm tyres on.
With the 26/34 the gear is 21" long and at 60rpm you do about 3mph.

 

[Scoosh]

Someone very smart will come along and tell you what gear inches/centimetres you would have with a 26/32 and 26/34 on a 700c wheel

Thank you @Ajax Bay !

 

[Nigelnaturist]

26x30=23.2"
24x30=21.42"
26x34=20.47"
24x32=20.08"

If the 32 fits get that and change the inner ring to a 24th if the 32 doesn't just fit a 24 inner as nothing else needs to be changed at all, not even the chain.

 

[Pat "5mph"]

26x30=23.2"
24x30=21.42"
26x34=20.47"
24x32=20.08"

If the 32 fits get that and change the inner ring to a 24th if the 32 doesn't just fit a 24 inner as nothing else needs to be changed at all, not even the chain.

Auch!! Numbers give me spinning fits!
Cheers @Nigelnaturist I have already bought a like for like, 11-30.
Actually, I have never changed just the one chain ring ( have replaced entire crank sets before), so this is something I will have to learn next!
Already got the wee tool to hold the back of the allen bolts

 

[Nigelnaturist]

@Pat "5mph" the wee tool is not needed for the inner ring on a triple.