Advertise on Bikeforums.net



User Tag List

Results 1 to 15 of 15

Thread: ChainRing size

  1. #1
    Member
    Join Date
    Jun 2005
    Posts
    49
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)

    ChainRing size

    What size chainrings do you use? I have a 55-44-30 with a 11-34 in back. I ride a 34(36) 50 on my single with a 11-25(don't use the 25much) Anyway in the N. Virginia area end up doing alot of hills, So I am thinking of gearing us down to 39, 53 I think we can still go like 37mph in a 53-11.

  2. #2
    hors category TandemGeek's Avatar
    Join Date
    Jan 2002
    Posts
    7,151
    Mentioned
    0 Post(s)
    Tagged
    1 Thread(s)
    54-44-32 w/12x27 for 90% of the terrain we ride and 12x32 for the mountains.

  3. #3
    Senior Member zonatandem's Avatar
    Join Date
    Dec 2003
    Location
    Tucson, AZ
    My Bikes
    ariZona carbon fiber tandem & single
    Posts
    9,962
    Mentioned
    1 Post(s)
    Tagged
    0 Thread(s)
    Our tandem 54/42/30 with 11/34
    Rudy's single 52/39/30 with 11/25 . . . got a triple on half-bike to allow for 'age' (better to have it and not need it, than to need it and not have it).

  4. #4
    Senior Member
    Join Date
    Aug 2005
    Location
    New Jersey
    My Bikes
    Colnago C40 HP, Aegis Trident, Cannondale tandem
    Posts
    491
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Going for a tighter gear ratio has always seemed the best approach to me: I don't like 2 tooth shifts that much, so 3 tooth are really unacceptable. Gearing up for that brief instant in time when you may hit 37mph isn't what I'd call a good idea: gear for the 90%, not the 0.01%. I run a 52/42/30 x 12/23. For those times when I can spin out the 52/12, I spin out. Good technique practice.

  5. #5
    Member
    Join Date
    Jun 2005
    Posts
    49
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)

    15% grades

    I use the 30 x 34 sometimes, with rides like the blue ridger, also in suburban DC lots of really short 15-20% climbs, can not see a tandem climbing that in a 30 x 23. As for spinning out, I have a fast cadence(the fixed gear bike causes that) so not really worried about spinning out. Waiting for a FSA 53 T chainRing for sale. Got a FSA 39T for 10$

  6. #6
    SDS
    SDS is offline
    Senior Member
    Join Date
    Mar 2003
    Location
    Grand Prairie, TX
    Posts
    702
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    I really like 53-39-28 on tandems and the appropriate cassette on the back, the narrower and higher the better. In Colorado on a single I will use 50-36-24. The nominal capacity of a Shimano FD is usually 22 teeth, but most of us cheat on that a little.

  7. #7
    Senior Member
    Join Date
    Nov 2006
    Location
    Lafayette, Colorado
    My Bikes
    1998 Co-Motion Co-Pilot
    Posts
    577
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Our largest gear is a 54/11. I know that this makes for big jumps between gears but to me there is no better feeling that flying down a hill in the 54/12, pulling alongside a couple of singles, dropping into the 54/11 and leave them gasping.

  8. #8
    Senior Member
    Join Date
    May 2005
    Posts
    569
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    I like a narrower cassette and we don't attack the downhills. So, we're using small chainrings -- 48, 38, 26 with an 11-27 10sp cassette.

  9. #9
    Elite Rider Hermes's Avatar
    Join Date
    Oct 2006
    Location
    San Francisco Bay Area
    My Bikes
    Too Many
    Posts
    8,258
    Mentioned
    20 Post(s)
    Tagged
    0 Thread(s)
    Tandem 53/39/30 11/34 10sp Road bikes: 53/39/30 12/27 10sp

  10. #10
    Banned. galen_52657's Avatar
    Join Date
    Jun 2004
    Location
    Towson, MD
    My Bikes
    2001 Look KG 241, 1989 Specialized Stump Jumper Comp, 1986 Gatane Performanc
    Posts
    4,020
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    53/40/28 with a 12-26 eight speed cassette

  11. #11
    Time for a change. stapfam's Avatar
    Join Date
    Jan 2004
    Location
    6 miles inland from the coast of Sussex, in the South East of England
    My Bikes
    Dale MT2000. Bianchi FS920 Kona Explosif. Giant TCR C. Boreas Ignis. Pinarello Fp Uno.
    Posts
    19,915
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    We use a Mountain Tandem on the few road rides we do. 48/11 is our highest gear and that will do us for 30mph on the road. For the road randonnees that we do- very few bikes are faster than us, and we will always catch them on the downslopes so why bother. I know an offroad machine on the road is a compromise- but we have the gearing that is right for 99% of our rides and we are rarely as high as that top gear. The 1% by the way will be on the downhills- when we will be coasting anyway.
    How long was I in the army? Five foot seven.


    Spike Milligan

  12. #12
    Member
    Join Date
    Apr 2006
    Posts
    32
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    You ask what chainring sizes we have: 22-36-44
    I think this is only relevant information when the size ans number of sprockets are also listed, but I see most of the earlier respondents only give their smallest- ans largest sprocketsize. I think however that all the intermediate sizes are important too. But probably nobody agrees with me so I will lso give the highest- and lowest sprocket: 8 speed 34-13
    The lowest are for extreme steep hills and the highest (which you all will consider rather low) for flat roads without wind: At 90 rpm we drive then at 24 mph. If we have a backwind and/or if we descent a hill we never cycle at higher speeds so we stick to 90 rpm spinning without with low force/power, so we don't need or want higher gears (because that would mean lager gaps in the range we often use).

  13. #13
    Junior Member
    Join Date
    Nov 2006
    Posts
    10
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    53x11@90 rpm =33.95 mph, @100rpm =37.72, 110rpm=41.50, 120 =45.27mph. I can't imagine needing much more than that if you can spin the 53 plus the shifting will be much cleaner.

    I run a 56/44x11/23 and I rarely see long climbs that we can't get over. Of course I never take the tandem into the hills unless forced...

  14. #14
    Senior Member
    Join Date
    Sep 2004
    Location
    Wellington, NZ
    Posts
    111
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    We have 50/40/30 on ours, with an 11-30 (or is 32) 9 speed cassette. With no intention of racing we don't have need of anything more. I don't think we've ever used the 11 sprocket.

    On my TT bike I have a 53/11 top gear, but can't recall using much more than 53/15 (down to 13 with a tail wind perhaps) most of the time - that's 45 kph at 100 rpm.

  15. #15
    shut up and ride
    Join Date
    Nov 2005
    Location
    noho
    My Bikes
    supersix hi-mod,burley duet tandem,woodrup track,cannondale cross,specialized road
    Posts
    1,942
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    our tandem has a 53/42/26 x 11,12,13,15,17,19,21,24,28 this give the same low gear as the stock gearing that it came with which was a 30 inner chainring and a 11,12,13,15,18,21,24,28,32 nine speed and more one and two tooth gaps instead of the two and three tooth gaps in the middle. the 15,18,21 three tooth gaps really sucked especially in a group ride. the 15,17,19,21 is much better.

    my main road bike has 53/39 x 12-23 ten speed

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •