Different Gearing for Redline
11-29-06 | 01:49 PM
#26
Arizona Dessert
Joined: Jun 2004
Posts: 15,029
Likes: 2,170
From: AZ
Bikes: Cannondale SuperSix, Lemond Poprad. Retired: Jamis Sputnik, Centurion LeMans Fixed, Diamond Back ascent ex
Look at the 100rpm speed. Assuming 700x25c tires:
42x16 = 20.6mph
42x15 = 22.0mph
42x14 = 23.5mph
42x13 = 25.4mph
I go with 42x14 if you really are serious about wanting to cruise at this faster speed. It will slow your acceleration out of starts and will be very wearing on headwindy days and long climbs.
Safe bet is just to drop a tooth on the rear cog to 15 get comfortable with it and later go to 14 if you still feel the need. Having a collection of cogs is a nice thing.
Add 50% to above speeds to get an idea of burst speeds.
Another option is to work at cruising at 120rpm with your existing gearing which results in 25mph. Maybe not the most effcient, but very doable.
Al
42x16 = 20.6mph
42x15 = 22.0mph
42x14 = 23.5mph
42x13 = 25.4mph
I go with 42x14 if you really are serious about wanting to cruise at this faster speed. It will slow your acceleration out of starts and will be very wearing on headwindy days and long climbs.
Safe bet is just to drop a tooth on the rear cog to 15 get comfortable with it and later go to 14 if you still feel the need. Having a collection of cogs is a nice thing.
Add 50% to above speeds to get an idea of burst speeds.
Another option is to work at cruising at 120rpm with your existing gearing which results in 25mph. Maybe not the most effcient, but very doable.
Al
11-29-06 | 02:51 PM
#27
or tarckeemoon, depending
Joined: Dec 2005
Posts: 7,017
Likes: 2
From: the pesto of cities
Bikes: Davidson Impulse, Merckx Titanium AX, Bruce Gordon Rock & Road, Cross Check custom build, On-One Il Pomino, Shawver Cycles cross, Zion 737, Mercian Vincitore, Brompton S1L, Charge Juicer
Originally Posted by noisebeam
Look at the 100rpm speed. Assuming 700x25c tires:
42x16 = 20.6mph
42x15 = 22.0mph
42x14 = 23.5mph
42x13 = 25.4mph
I go with 42x14 if you really are serious about wanting to cruise at this faster speed. It will slow your acceleration out of starts and will be very wearing on headwindy days and long climbs.
Safe bet is just to drop a tooth on the rear cog to 15 get comfortable with it and later go to 14 if you still feel the need. Having a collection of cogs is a nice thing.
Add 50% to above speeds to get an idea of burst speeds.
Another option is to work at cruising at 120rpm with your existing gearing which results in 25mph. Maybe not the most effcient, but very doable.
Al
42x16 = 20.6mph
42x15 = 22.0mph
42x14 = 23.5mph
42x13 = 25.4mph
I go with 42x14 if you really are serious about wanting to cruise at this faster speed. It will slow your acceleration out of starts and will be very wearing on headwindy days and long climbs.
Safe bet is just to drop a tooth on the rear cog to 15 get comfortable with it and later go to 14 if you still feel the need. Having a collection of cogs is a nice thing.
Add 50% to above speeds to get an idea of burst speeds.
Another option is to work at cruising at 120rpm with your existing gearing which results in 25mph. Maybe not the most effcient, but very doable.
Al
25 mph sounds nice, but for city riding fast acceleration will gain you about as much time as a higher top speed and lower gearing is less taxing on your body and drivetrain.
11-29-06 | 04:23 PM
#28
Geezer Member
Joined: Sep 2003
Posts: 1,384
Likes: 0
From: Cedar Rapids, IA
Bikes: Airborne, LeMond, Bianchi CX, Volae Century, Redline 925 (fixed) and a Burley Tandem.
Originally Posted by marqueemoon
25 mph sounds nice, but for city riding fast acceleration will gain you about as much time as a higher top speed and lower gearing is less taxing on your body and drivetrain.
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Carpe who?
11-29-06 | 08:16 PM
#29
live free or die trying
Joined: Oct 2005
Posts: 6,999
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From: where i lay my head is home.
Bikes: bianchi pista workhorse, cannondale r1000, mountain bike fixed conversion
yeah, for city riding, you don't exactly need to race from red light to red light. i've learned that just keeping a steady pace and hitting the greens is way more effective than constant sprinting.
11-30-06 | 10:01 AM
#30
Thread Starter
Drumming Bicyclist
Joined: Feb 2006
Posts: 222
Likes: 0
From: Boston, MA
Bikes: Redline 925
picked up an AC 888 15 tooth freewheel from Harris Cyclery last night... will check this out.
i agree on the city riding comments, as i'm in that environment alot. but there are plenty of long stretches too where i'd like a bit more top end speed
i agree on the city riding comments, as i'm in that environment alot. but there are plenty of long stretches too where i'd like a bit more top end speed
11-30-06 | 04:37 PM
#31
Senior Member
Joined: Apr 2006
Posts: 105
Likes: 0
For those long stetches I added these aero bars (Harris and Nashbar sell them) that give me a tucked riding position that I can't get with the Redline's moustache bars (which I like for everything else).
smallpic1.jpg
smallpic1.jpg
Last edited by Jim in KC; 11-30-06 at 05:03 PM.
11-30-06 | 05:13 PM
#32
Senior Member
Joined: Mar 2006
Posts: 2,760
Likes: 0
From: San Francisco
Bikes: Steelman eurocross, Surly CrossCheck, IRO Rob Roy...
The 42x16 on my 925 works well 90% of the time for city riding in San Francisco. The other 10% of the time (like when I'm trying to catch someone in the park with a bigger gear) I wish it was higher. Then I fly by some cat on a hill and life is good again. The bottom line is, I'm out of shape.
