|Anybody want an unused 53 tooth chainring?||Len J|
Nov 6, 2001 11:52 AM
|I have been noticing lately that I very rarely (if ever) use my large 53 tooth chainring. Here is why.
I am a spinner, normally around 110 rpm, consequently for pacelines up to about 26mph I can run in the 39X13 (I know this is crossover but 24mph is in 39X14, why shift to big ring for one jump?) The next shift would be to 53X19 for speeds around 27mph (A downshift of 4 gears in the back for the shift to the big ring in the front), I just don't ride this fast.
I live in the flats, therefor the argument that you need the big ring for rolling out downhill just doesn't fly.
It seems to me that the best gearing (from a calculation standpoint) would be a 39/46 in the front, 12X23 in the back. This would give me a top end of around 33 MPH, but would allow me to utilize more fluid gear combinations. There would only be two shifts down in the back for a change to the bigger ring in the front.
In thinking on this, I think this would work better for most spinners.
1.)Why don't more people gear this way?
2.)Where can I get a 46 tooth chainring that will fit a D/A crank?
|re: Anybody want an unused 53 tooth chainring?||JVR-OCLV|
Nov 6, 2001 12:22 PM
|I will take the chain ring. I just wore mine out.( I like pushing the big gears) Let me know and I will send you my mail address!!|
|Why most people don't gear this way...||TJeanloz|
Nov 6, 2001 1:11 PM
|While you may be pedaling 110rpm consistently, most people are not able to sustain that cadence- or for whatever reason choose not to. But even if we all did, gearing is a compromise to best meet the needs of most people.
What it comes down to is gear overlap. People pay good money to have 20 speeds on their Campy Record (or 18 on DA). With the 39/53 combo (12-23rear), there are only two combinations within 1 gear inch of each other (39/14-53/19 and 39/17-53/23) with a 39/46 combo there are as many as five overlaps. So instead of 17 speeds, you effectively have 13.
Your argument is effectively that you don't plan to use a gear-inch combination greater than a 46/12 (101.3"). So you could skip the 12t and 13t altogether (with a 53/14), and have a straighter block cassette- yielding all around tighter shifting- with a bigger range.
As an interesting aside, Frank Vandenbrouke rode with only a 12/21 cassette (the straightest block avaliable), regardless of the course, and changed his chainrings to suit the hills.
|Why most people don't gear this way...||Len J|
Nov 6, 2001 2:39 PM
|Good answer, I hadn't thought about overlap.
Even maintaining 100rpm, when would I use 53X12,13 or 14 (34.6,31.9&29.7 mph respectivly)?
I guess that if I follow this to it's logical conclusion that I should have a straight block 15X23 with a 53/39 to have the widest range (no overlap) of usable (in the real world) gears. Now the question becomes, How/where can I build/buy such a cassette?
|your straight block||Dog|
Nov 6, 2001 5:00 PM
Nov 6, 2001 1:15 PM
|because the pros don't|
Nov 6, 2001 1:21 PM
|Excel carries a 48 large ring. http://www.excelsports.com/item.asp?major=1&minor=12&description=Chainring+Large&vendorCode=STRONGLI
A 48/42 combo ought to shift really nicely.
If you are riding only on flat to rolling terrain, why need a 39?
|39 for headwind..||Len J|
Nov 6, 2001 2:33 PM
|but it's a good question, as I hadn't thought about it that way.
|many weight weenies use it||cyclopathic|
Nov 6, 2001 2:49 PM
|with 11t cog|
|Thanks, already got one on every bike I own||cory|
Nov 6, 2001 1:36 PM
|Except the Atlantis, because I chose my own gearing for that and it's running 46-36-26.|
|an unused 53 tooth chainring on every bike you own? :)||ET|
Nov 6, 2001 2:11 PM
|Maybe you ought to, like, ride a little. :-)|
|What can I tell you? I'm 56 years old and live in the mountains||cory|
Nov 6, 2001 2:53 PM
|That's why I geared the Atlantis down. No point in hauling around a 53 when a 46 gives me all the gears I can push.
I'd be interested to see how many riders REALLY can use a 53-11 or 53-12, though.
|What can I tell you? I'm 56 years old and live in the mountains||STEELYeyed|
Nov 6, 2001 5:44 PM
|I use 53-12 allot here in the Iowa flatlands,with a 25-30mph tailwind,I could probably use more gear,but when I turn a corner and face the beast,its back to the 42. The wind here in the Spring and Fall can be demoralizing.|
|re: Anybody want an unused 53 tooth chainring?||kyroadie|
Nov 6, 2001 2:12 PM
|I would keep the 53 and go for a 42 on your small chainring.|
|Most poeople don't ride exclusively on flats||Chris Zeller|
Nov 6, 2001 4:00 PM
|Bikes in general are designed to be used in a wide variety of terraign. This might be hard to understand if you live in the midwest--but the whole world isn't flat like it is there. Plus there is a lot to be said about riding in hills, I find it much more fun than on flats.
I use my 53/11 gear quite frequently. Actually, even at 110 rpm a 53/11 gear combination equates to about 41 mph, which isn't very fast by road bike standards. I usually chicken out at the slow speed of 38 mph which is around 100 rpm for this gear combo.
|Why don't you run a single 46T ring?||MB1|
Nov 6, 2001 4:33 PM
|Anyway Peter White Cycles online has the full size run of chainrings (TA I belive) for Shimano road.|
|Thanks all......||Len J|
Nov 7, 2001 4:51 AM
|for the great information. I hadn't thought about redundant gears and wasn't sure where to go to get the flexibility ton experiment. I'll probably use Doug's link & buy the custom cassette kit & experiment with different cassette's first & then make the decision as to wether or not to buy a smaller chainring.
After all having 18 gears is only useful if you use them once in a while. I figure that right now with a 53/39, 12X23 combination, I only have 13 or 14 truly usable gears (for this weak flatlander). If nothing else, it will be interesting to experiment.
|Want it for my neighbor's dog Getem! ...||breck|
Nov 7, 2001 8:41 AM
|My east-forty fence neighbor's dog Getem!, who appears to have been sired by an African crocodile and a Russian Wolfhound, and who terrorizes my pet Texas Longhorn Sam Houston who is just a kitten at heart, tore up two of my new Hi-Tek Titanium Frisbees on the catch, then swallowed them whole. His owner just laughed and patted the hapless pup on the head remarking "He'll retrieve any dang thang yah throw!" |
And when inquiring of him why he always sics his mutt on my pet steer he just replies he's just callin' 'im home "Hay, Getem!" Hay Getem!" Sam then high tails it to that ol' now abandoned Badger hole (whom Getem! cleared off the property first week he jumped the six foot bob'd war fence) near the south-forty boundry and buries his poor head with the six foot long horn spread on each side at which point Getem! commences to knaw on one tip or tha other.
Must be humiliatin' i know as it took six brave Mexican vaquero's to tame Sam back when he was a match for the most brave Mexican brush popper to pull him outta Dead Dog Canyon back in '91. Then i have to drive the old '59 Dodge Power Wagon down there, lasso Getem! with the steel 16 gauge steel stranded cable, put the Goat in bull-dog-low and haul 'em back next door fore he chews all tha strands apart. Some times i don't make it.
That 53 tooth should fit right inside the one remaining Frisbee.
Catch this yah mangy mutt! ... :)
|LOL, Thanks I needed that......||Len J|
Nov 7, 2001 9:44 AM
|it's been a crappy week. I am sitting here trying to picture "..a cross between ann African crocodile & a Russian Wolfhound." I think I may have dated her once in a drunken stupor...ah but that's a different story.
|... a crappy week ...||breck|
Nov 7, 2001 10:43 AM
|A crappy week here on the ranch is ... |
1. Your septic tank has backed up and you can not find either of the two lids which the previous owner has built a patio over using granite slab.
2. Your well pump head three hundred feet down will not pump and your storage tank is empty. Hay, at least don't have to worry bout ant-track's contamination :)
3. Your 5K water storage tank has more holes in it than you can keep up with using the otherwise worthless Park quick patches.
4. Your propane tank is empty and the driver can not get thru the three ft. snow. Also you have just converted the truck to the at-the-time cheap $1.22 the gallon propane so you can't go nowhere 'cept on the mountain bike w/chains but the only chains you got are for the Ford tractor tires, and the rear one's at that! And now, of course, propane delivered is higher than 87 dino gas at the pump.
5. You have gone thru the last of the old down tube Dura-Ace 1.5mm shifter dX wire and the latest kid at the LBS thinks you are talking brake wire. Hmmm, mebee shape that little brake lead termination a dX end? And yes i know cold drawn 1.2 is just as sturdy, etc., butte am retro! He also never heard of 8-speed chains.
6. Getem! just went thru the bike shed and took the Al Klein MTB out and buried it where i don't know.
7. Getem! just came back for the OCLV and crunnch!, he ate the frame & fork! There goes the idee of old Sam Houston's replacement CF horn set. Maybe db CroMo from the remaining Specialized Allez frame??
8. ...add your brand of woes to the list :)
The "story" (as you and ol' keith may guess) was stole from an article in the now defunct Mountain Gazette published out of Boulder (~ 1970-1974) and Harvey Manning of the Seattle Mountaineers doing sim-to story in the Gros Pekker Range :) of Euro Mountains 'bout a peak climb duo of competing crusty old tymers. The one ol' Tymer had Getem! and the other old tymer complained he could not sleep at nite cause of the sheep bleating from the other's tent, etc:)
With a little inspiration could turn this into a road bike in-the mountains race story too, etc. Manning also published a nifty little tome titled ~ "Bicycle Gearing" which i once made up and used taped onto the top of the stem to find the "next-best-gear" to click into, etc. Have misplaced the tome in a "senior moment" :) Manning did a great MG article on "Beer" too you would laff at.