10 tooth differences are great. Crossing over from the large to the
smaller, either you are in a hurry to get your shift completed, so you
upshift once in back and you're at the next step down, or if you're not
in a hurry, you make the shift and wait one or two heartbeats and you've
slowed down just enough so your cadence is in the correct range and
you're at the next step down. Where they don't offer as much as the
wider spaced rings is in the maximum range. But if your lowest gears
are low enough for your strength and riding territory, they're a whole
lot more pleasant to live with in day to day use.
The way I use mine (36/46 or 36/48 with a 24 or 26T granny) I'm on the
big ring 90% of the time. I stay on the big ring until I need lower
than around 50 inches, and then cross over. I'm not a fan of small
chain rings and tiny sprockets as a way to get reasonable cruising
gears. I'd rather put my 65-75 inch gears on the big ring and the
middle of the cassette. I'm also a big fan of Sheldon's 13-30 9 speed
cassette. Depending on the wheel size, 46 or 48 x 13 gives me a top
gear between 95 and 100 inches, which is just right for me. It's a high
gear I'll use on every ride, and on the short rollers where I ride I
have no need for a top gear higher than 100. I'm not sprinting and I
don't pedal down long mountain descents. (Me, it's like dropping a piano
off the Chrysler Building, look out, boys!)
But, it all has to work for you, in the terrain you ride in.
On 05/29/2016 09:21 PM, Tim Butterfield wrote:
Steve,
Thanks for the reality check. I did a different check and agree, 4mph
is a bit too slow at 90 cadence. :) I found another neat, sharable
tool. What do you think of this combination?
http://www.gear-calculator.com/?GR=DERS&KB=36,46&RZ=11,12,13,15,17,19,22,25,28,32&UF=2200&TF=90&SL=2.6&UN=MPH
The 36t ring should be all I need for a while. Maybe some day I'll
graduate to the 46t ring. The 34-50 might be possible, but the 36-46
seems a better fit.
Tim
On Sun, May 29, 2016 at 4:17 AM, Steve Palincsar <[email protected]
<mailto:[email protected]>> wrote:
On 05/29/2016 05:15 AM, Tim Butterfield wrote:
Building further on the 2x10 possibility, I did some further
playing with Sheldon's gear inch calculator. If I could pair the
Sugino XD2 26t-40t crank with the Praxis 11-40 10 speed cassette,
that would provide a range of 26x40=17.6 up to 40x11=98.2. From
17.6 to 98.2 is quite a range of gear inches. I not sure if I
would use either extreme, but they might come in handy if I ever
needed it, especially if I put a decent sized bag on the back
rack. For a weak rider that might have a mix of flats and hills,
what would you think of that range?
It's not just the range. Here's your proposed gearing (if not
the exact cassette, close to it):
63.8 98.2
54.0 83.1
46.8 72.0
41.3 63.5
36.9 56.8
33.4 51.4
29.2 45.0
25.1 38.6
21.9 33.8
19.5 30.0
17.6 27.0
A good general rule is you want your main cruising gear, the one
you use for level ground w/o winds helping or hindering, to be in
the middle of the cassette. Here you are on the 3rd position.
Going up has one moderate step and one pretty large one. Going
down, you have plenty - enough so that for anything but seriously
hilly country you need never go to the small ring. But when you
do, look at what happens: you drop so much you'll feel as though
you dropped the chain, and will have to immediately upshift two to
four times to get to the "next lower" gear, depending on where you
are on the cassette. That can be hard to live with. Also, 17.6
is exceptionally low. Most people only have a use for a gear that
low in the most severe terrain when they are carrying loaded
panniers front and rear.
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