Jan 27, 2002 6:44 PM
|I am 53 and have been riding for 2 yrs on a hybrid CD Silk Path 700 with 24/34/42 chain rings and 11-30 cog with a slighty upright riding position. I ride mainly in flat area of TX but will go to Austin where it is hilly for me and have used that dreaded "grannie" gear a few times in Austin. I have recently bought a road Ti frame and can not decide which way to go concerning the drive train. I am going with Campy but need some advice on going with a 10 double as opposed to the new triple 10 when it comes out. I have read some posts that talk about having to do a lot of "trimming" with a triple on a road bike. If this is true will it be worst with the 10 triple or not. How much better is the 10 double over the 9 double. Would the racing triple 9 speed be an option for me? What cog set would be best for me on flats and out in Austin also? I have talked to a lot of different LBS's and have gotten a lot of info but saw this forum and thought that I might could gain some more insight here. Is there anyway to tell how much effort will be needed to push the larger chain rings (39-53) over what I currently am riding? Any suggestions or information to help me in deciding which way to go would be appreciated and maybe this headache will go away!!!|
|re: Road Bike-Double/Triple||Chen2|
Jan 27, 2002 7:42 PM
|"Gear inches" is an easy way to compare gear combinations from one set-up to another. If you decide to buy the Campy 10 speed double with 53-39 rings and 13-29 cassette, the lowest gear combination will be the 39 ring and 29 cog. Calculate the lowest possible gear inches as: 39/29 X 27" = 36.3 gear inches. Then calculate some combinations on your older hybrid bike until you find approximately 36 gear inches. As an example: 24/18 X 27 = 36. That would be your small ring 24 and the 18 cog in rear (if you have such). Or with your middle ring 34/25 X 27 = 36.72. Then any hill you can now climb on the hybrid with 36 gear inches you can easily climb with the Campy 39/29 combination. Actually you'll be able to climb much steeper and longer hills on the new light weight Ti framed bike than you now can on the hybid an a comparable gear combination. I'm 59 and prefer the quick smooth shifting of a double and I can climb hills similar to your Austin hills with my Dura-Ace 53-39 rings and 12-27 or 12-25 cassettes. BTW, there are gear calculator spread sheets available on the net, some are metric, but I usually just use a hand calculator, the 27" number is just a standard wheel diameter constant. If you want to calculate run-out it would be better to use a more accurate measurement.
|the triple seems to make sense...||PdxMark|
Jan 27, 2002 9:16 PM
|The math and comment in the previous post about being able to climb better on your new, lighter bike are right. But having used the grannie gear on your current bike 24/30=0.80 gear ratio, I think a double might not give you low enough gears for those Austin climbs...
a double on your new bike, with a 39 tooth small ring would give you gear low ratios of 39/27=1.4 or 39/29=1.34 (I'm not certain how big the largest rear cog gets in Campy sets - 27 or 29 - or even larger???). This means that your lowest gear in a double set-up 39 small in front, 29 large in back, would be more than 50% "harder" than your current grannie gear.
a triple with a 30 tooth small chain ring would give you gear ratios of 30/27=1.1 or 30/29=1.03... much closer to, but not yet matching, your current granny gear...
these ratios are probably off, depending on what large cog you can get in back, but these simple ratios will help you translate your current granny gear into your new bike granny gear to be... so you can gauge how you felt on those climbs with your current and prospective low gear ratios...
enjoy the new bike... congrats
Jan 28, 2002 7:23 AM
|Absolutely. A double (even a 53/39 with a large cassette) won't even remotely approach the low-end gears you've had on the hybrid, where you've occassionally dropped into granny. No contest.
The last thing you need is to build a nice road bike and decide you made a mistake that will cost you a new crank, BB, derailleur. And to the touring/hobbyists among us in hilly places, triples stay very marketable for resale.
Jan 28, 2002 8:29 AM
|For many of us the advantages of a triple far outweigh the drawbacks. The added weight is small and the added range without giving up the luxury of a lot of useful, flat land gears is really important to me. I have a Campy racing triple and find the trimming very simple and pretty infrequent. Get the triple unless you plan on getting younger.|
|re: Road Bike-Double/Triple||Mikey2k|
Jan 28, 2002 9:48 AM
|Keep in mind that Shimano offers lower gearing than Campy.
I have a Campy triple with 30/28 low gear, and sometimes
I wish I had lower for really steep hills. Shimano will
let you go to a 34 cog if you really need it. I have
thought about going with a 28 chainring to replace to 30
but have not yet done so. I have often wondered why
Campy does not offer bigger cogs for those who need it.
|re: Road Bike-Double/Triple||_Marty_|
Jan 28, 2002 4:46 PM
|I think you should go with the triple setup.. see whats the biggest rear cog you can fit on your bike for the hills... if you like the spread on it for the flats.. you might luck out and not hafta change anything to ride at home and at Austin.. hope this helps|
|re: Road Bike-Double/Triple||pedal-pusher|
Jan 29, 2002 4:56 PM
|Thanks for all comments and suggestions. Looks like I am out to get that triple because I ain't getting any younger these days. Happy cycling all!!!!!!|
|re: Road Bike-Double/Triple||Chen2|
Jan 30, 2002 7:33 AM
|If you go with the triple then get the new Dura-Ace. It will shift much better than the Ultegra triple and the 39t middle ring will let you climb those Austin hills without having to drop off to the 30. Or you could choose the Campy Racing T with 50-40-30 rings if the 50 is big enough.
|re: Road Bike-Double/Triple||M.E.|
Jan 30, 2002 2:22 PM
|The Campy 50 big ring on the 50-40-30 is plenty big enough for anyone that is not into licensed racing, which this gentleman is not. You really have to have some legs to even push the 50/13 combination for any distance, more than enough big gear for any recreational/century rider. Either way, the triple is the way to go.|
|re: Road Bike-Double/Triple||Matjaz|
Feb 5, 2002 12:11 PM
|Hi there !
I also suggest triple. The only question is whether Shimano or Campy. Last season I was driving Campy triple Veloce , but I was very disappointed. It was always very difficult to shift properly to find the middle chainwheel. I found it very rarely with first shift. I always had to make corrections -fine tuning- (which with Campy IS possible) to avoid sliding the chain towars front derailers arm. What was also very annoying is that I had to make the finetuning of front derailer position also when the gear on the rear sprockets was changed (to avoid sliding chain towards front derailers arm).
To make me clear: With Campy was not a problem to shift on small or big (front)chainwheel but definetly to middle one. I do not remember such problems when driving MTB with Shimano LX Deore gears. It is known, that Shimano has "digital" shifting while Campy Has "analog". I do not find a problem with Campy solution with double, but triple siply does not work fine. I however did not try Ultegra or Dura Ace triple or any roadbike Shimano triple. Does somebody have such experience? I would appreciate to hear some experience with that, because I seriously consider buying one of these ASAP.
Best regards, Matjaz