antgel wrote:
[snip]
Quoted message said:
Is an aluminium frame likely to be worth the extra £50, given the length
of journeys that I am likely to make, and given that I am not bothered
about speed? My understanding is that the alu frame is lighter and
should therefore enable quicker or longer progress for the same effort.
Given the nature (town) and length (10 miles max, 1-5 more likely) of
my journeys, should I care?
Lighter is generally preferable, but you should check the actual weight
of each to be sure the Al bike really is lighter. Although aluminium has
lower density than steel, it is not as strong or stiff, so typically you
need more of it for the same job. My view is that, except for serious
competitive riding, weight is often taken too seriously. When I'm
touring I'll put perhaps another 30 or 40 lbs of kit on the bike; it
does not make that much difference to my progress. It's a bit more
effort up hills, but you can get some of that back going downhill, and
the bike coasts more readily over smaller hills because of the extra
kinetic energy. For what you are proposing it is probably more important
that the frame is strong and stiff, so that it copes when, for example,
you try putting a lot of groceries on the rack, and it does not get
seriously dented if it takes a knock.
(If the rack offered as standard on the "cheltenham" is any good, it's
well worth having because then you can fit panniers. Carrying a rucksack
while cycling is entirely possible, but it is not comfortable.)
If the weight of each is quite similar (within, say, 5 lbs) it's
probably not worth worrying about, especially for what you intend. Your
cycling effort is going to depend more on things like the type of tyres
fitted. The general rule is that narrower tyres and higher pressures
make for less effort, but you don't want to go too far with it. For
around town transport use a tyre width of 1 1/4" is probably as narrow
as you want to go, both for comfort and for coping with potholes etc.
You certainly do not want knobbly, off-road style tyres, they just waste
effort on roads.
--
Joe * If I cannot be free I'll be cheap