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Double or Triple(19 posts)

Double or Triplerookierider
Mar 2, 2003 4:49 AM
I'm deciding on components for a new bike and am torn between going with a double or triple crankset, and then the cassette size. The only decision I'm certain of is it will be Campy Record. I'm more a recreational rider living in hilly PA; am not the fittest out there but do okay. Also like to do long rides. I don't understand enough about the gearing ratio's to make an educated decision. Any advice appreciated.

Thanks
re: from what you're sayingcyclopathic
Mar 2, 2003 5:59 AM
you might be better with triples. Climbs in PA are not very steep but they tend to be longish. If you like long century+ hilly rides you'd appreciate lower gear ratio. Other option would be to get 13-29 Campy cass it has almost the same lower gear as 11-23 on triples. But then if you find that 29 isn't enough or 13 is too low you're out of options.
what do you have now??C-40
Mar 2, 2003 6:07 AM
Not to be rude, but if you have a bike and experience with your terrain, shouldn't you know by now what gearing that you need?

The widest range will obviously be obtained with a triple. With a double, the lowest gear you can get is a 39/29 which is a ratio of 1.34 or 36 "gear inches" (the ratio multiplied by 27). The 13-29 cassette will restrict your top gear to a 53/13 and top(pedaling)speed to about 38 mph at a 120 rpm cadence.

A 53/42/30 triple will give you a 28 inch low gear with a 13-29 cassette. If you want or need a 12 tooth cog to add another 4 mph of top pedaling speed, the triple would allow you to use a 12-25 cassette which will produce a 32 inch low gear. This is one step lower than the 36 inch gear that the double would have, plus it provides one step higher (53/12) on the top end.

The only disadvantage to Campy's triple is the 42 tooth middle cog (instead of the normal 39). This combo will require you to shift to the 30 a bit more often than if you had a 39.
30-40-50Rusty Coggs
Mar 2, 2003 6:31 AM
Campy record triple is also available with the alternate chainrings.But honestly if you are buying record shouldn't you know aout gearing and what you need, as mentioned?
42 is disadvantage??cyclopathic
Mar 2, 2003 6:57 AM
42t is the best part of triples. 42/25 gives same ratio as 39/23 and 42/27 = 39/25. However transition from and to big ring is much smoother.

Most people with triples I know use them as doubles with back up.
42 is disadvantage??Rusty Coggs
Mar 2, 2003 7:18 AM
I put 39s on mine.Never was much of one for theory and numbers,but since I have doubles(39) and and triples,it just feels better.
the disadvantage....C-40
Mar 2, 2003 7:53 AM
With a 42 middle ring, it's like losing your lowest cog.

Since campy doesn't offer a 27T in ten speed, you only get the low gear of a 39/23 in a 42/25 (with a 12-25 cassette), which means you have to shift to the little cog more often.

The majority of riders use a 53/39 these days. The 42 hasn't been popular since the introduction of indexed shifting. The 42 ring was useful before indexed shifting because if only required a 1-cog shift after a change in chainrings. A 39T chainring requires a 2-cog shift which is fast and accurate with indexed shifting. A 53/39/30 would provide the maximum range with a double, leaving the 30 only for severe conditions.

The 50/40/30 is a bit better, but sacrifces the top gear, which is like losing the smallest cog.
Campy 26Rusty Coggs
Mar 2, 2003 8:01 AM
But then no 12...:(
re: 42tcyclopathic
Mar 2, 2003 3:22 PM
I have 2 triple bikes (both Shimano) one with 12-25 and another 12-27. While I prefer 12-27 I could live with 12-25.

You're right to get to one ratio down you need to drop chain upfront and upshift rear. On 42t it is one click on 39t it is 2. The main advantage of 42t is that I can double shift while standing on climb w/o loosing momento. When I was running doubles with 39 I always worried that I may misplace family jewels on stem this time on downshift/double upshift. And I do not miss that one gear at the bottom.

However I do appreciate one on top. 42t seems to be suited better gear for kind of fat a$$ slow solo riding I do. 42 by 12 gives high enough gear on flats, so 52 only gets lubed if I have tailwind, downhill or ride aerobars. Or draft.

CP

PS btw besides steep hills/long miles the reason I went to triples was a Q-factor I was having problem with knees.
yup, trpiles = doubles with backup/bailout! nmMrDan
Mar 2, 2003 5:34 PM
re: Double or TripleKeeponTrekkin
Mar 2, 2003 8:04 AM
Lower gears allow you to climb a hill SEATED where, with higher gears you'd be forced to stand. Few of us can sustain the energy output needed to climb a long hill standing, even at low cadence. Think about it, do you pant or gasp for breath at the top of a long hill as you recover from the anaerobic activity?

Low gears allow you to climb more hills seated, which can be tiring but is always less taxing than climbing out of the saddle.

Most recreational riders want this flexibility. Whether you get it with a double and a wide spaced cassette or a triple and a narrower spacing cassette is HOW you get the gearing range and selection you want. I've never heard anyone with a triple say they regretted having the lowest gears.

Everyone likes the small steps between narrow spaced cassettes. Many say the front derailleur of a triple can give more problems than a double (many others say they work equally well); My opinion is that they both should work well and you should explore this issue with the shop where you intend to buy as this is frequently an adjustment issue.

Take your time and think through your needs and capabilities. Good luck.

KoT
Record 39/29 is pretty low!Mariowannabe
Mar 2, 2003 9:03 AM
I'm a mid-40s rec rider in good shape and recently purchased Campy Record 10. I debated the same issue and decided on the double with the 13-29. I find the 39/29 quite low and only use it on short really steep climbs. I find it too low to use standing while climbing. I retrospect, the main reason I'd consider a triple is not for the lower gear, but for the closer ratios in the back a 12-23 or similar would provide.
re:"Record 39/29 is pretty low!" is the cat's a$$ vs triple. nmSpunout
Mar 2, 2003 9:16 AM
agree...works really well for me tooukiahbill
Mar 2, 2003 10:00 AM
I have Chorus 10 sp. w/ a 13-29 cassette and haven't felt I needed anything lower than the 39x29 yet...and also am mid-40's and live in a hilly area. Did just order a 12-25 though and plan to run that most of the time and switch when doing VERY hilly and/or long rides since it is so easy to swap cassettes.
re: Double or Triplebhague
Mar 2, 2003 10:29 AM
I have a similar issue, and need advice. Just built up a Merckx Team SC w/Chorus med. cage rear, double 53/39, and 13-29 cogs. The low gear is similar to the 30-23 combo on my Specialized Allez w/triple Ultegra, which I do use some.

Now I've discovered the frame tolerance on the Merckx only allows an 11t small cog (designed for pure racing I guess). Using the 13t cog rubs the chain on the frame. I can switch to triple and an 11-23, but I understand that the Campy med. cage rear der. is only designed to handle 12t minimum, not 11 (why?). My other options: keep the double, switch to 11-23, and see if I can still make the climbs I've used the granny for in the past - which I'm not sure I can do - or stick w/what I've got and stay out of the 13t small cog, which limits me to a 53-14 high gear, which means I'm coasting down hills. Any thoughts before I spring for the triple kit? Thanks.
re: Double or TripleGenius
Mar 2, 2003 11:14 AM
I had a 105 triple in 96 or so when that was the highest level triple available. I replaced it just last year with the Dura-Ace triple.

I always ran a non ramped 39t middle on the 105 making it a 52/39 double with the granny along for the bail out.

The ramped 39t on the DA as well as the rest of the group is is a dream. The larger pulleys give it a race look.

All held together with a beautiful Hollands frame. I can't wait for the warm weather.
re: Double or Triplebhague
Mar 2, 2003 1:55 PM
I have a similar issue, and need advice. Just built up a Merckx Team SC w/Chorus med. cage rear, double 53/39, and 13-29 cogs. The low gear is similar to the 30-23 combo on my Specialized Allez w/triple Ultegra, which I do use some.

Now I've discovered the frame tolerance on the Merckx only allows an 11t small cog (designed for pure racing I guess). Using the 13t cog rubs the chain on the frame. I can switch to triple and an 11-23, but I understand that the Campy med. cage rear der. is only designed to handle 12t minimum, not 11 (why?). My other options: keep the double, switch to 11-23, and see if I can still make the climbs I've used the granny for in the past - which I'm not sure I can do - or stick w/what I've got and stay out of the 13t small cog, which limits me to a 53-14 high gear, which means I'm coasting down hills. Any thoughts before I spring for the triple kit? Thanks.
If you want to enjoy riding the hills in "hilly PA" get the triple.MB1
Mar 2, 2003 4:39 PM
If you ever want to ride with us in hilly MD, VA or WV get the triple.

If it is important to you that you look like a racer (even if you are not) get the double.
re: Double or TripleGenius
Mar 4, 2003 4:05 PM
Another benefit for me with the triple is the ability to run a tighter cogset. I do most of my riding on the 39t ring with a 12-25.