Advertise on Bikeforums.net



User Tag List

Results 1 to 20 of 20
  1. #1
    Senior Member
    Join Date
    Feb 2008
    Location
    UK
    Posts
    2,325
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)

    42-18 too high, should I go to 42-19 or 42-20?

    Hi all,

    I find the 42-18 (with 700x23, 170mm cranks) a bit too high for my style of riding, on my other fixed gear (700x35 tyres, 172.5mm cranks) I have 36-16 and find that just right.

    I want to use a bigger cog, but can't decide between a 19t or a 20t.

    How much easier is a 42-19 over a 42-18 (I have tried the gear calculators online but can't really get much of an idea from them). Should I go for the 20t?

    Thanks

    Daven

  2. #2
    Senior Member
    Join Date
    Mar 2011
    Posts
    317
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    You've really just got to try different setups out and get a feel for them. Every person's experience is different. But once you get an idea for a few, that should help you in gauging other setups you haven't tried. For instance, I use to ride a SS mountain bike at 32/18 which is a ratio of about 1.77. Since 39/22 is also about 1.77, I can expect that setup to feel the same, even though I've never tried it.

    Just give it a shot and see how it works out.

  3. #3
    Veteran Racer TejanoTrackie's Avatar
    Join Date
    Jul 2009
    Location
    Ciudad de Vacas, Tejas
    My Bikes
    28 frames + 73 wheels
    Posts
    7,735
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    It's all in your head. Both of your current bikes have the same effective gearing (61.4 .vs. 61.2 gi), so there must be some other reason that one feels too high and the other feels "just right." Longer cranks will make the gear feel a bit easier, but the difference between 170mm and 172.5mm is very small, so I doubt that's it.
    What, Me Worry? - Alfred E. Neuman

    Quote Originally Posted by Dcv View Post
    I'd like to think i have as much money as brains.

  4. #4
    Senior Member hamish5178's Avatar
    Join Date
    Jul 2010
    Posts
    1,021
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by TejanoTrackie View Post
    It's all in your head. Both of your current bikes have the same effective gearing (61.4 .vs. 61.2 gi), so there must be some other reason that one feels too high and the other feels "just right." Longer cranks will make the gear feel a bit easier, but the difference between 170mm and 172.5mm is very small, so I doubt that's it.
    Could be the massive difference in tire size, but that would make the second bike harder to pedal. Maybe OP doesn't understand gear ratios?
    Quote Originally Posted by hairnet View Post
    It's a fixie, reasonablility was never a factor.
    My poser bike

    my non-poser bike?

  5. #5
    Senior Member
    Join Date
    Feb 2008
    Location
    UK
    Posts
    2,325
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    No, I understand gear ratios, and by looking at all gear calculators they should be roughly the same or the second bike should be harder. Think I will have to just give it a shot.

  6. #6
    Nipples of Steel! AngelGendy's Avatar
    Join Date
    Feb 2011
    Location
    ABQ
    My Bikes
    Borthwick, Specialized, Ross
    Posts
    414
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    I don't understand gear ratios at all, but I started with a 40/16 setup and it's too... not sure if it's high or low..... see I told you I don't know about gear ratios.... but I'll be adding a 13 to the other side, and keeping the 16 just in case I feel slow that day....
    1975 23" Ross Grand Tour Fixed Gear (Fujita Belt)
    1987 21" Specialized Rock Hopper(B-17)
    1989? 15" Specialized Rock Hopper (B-17s)
    1992 60cm Specialized Allez Pro (Wright W3N)
    1986 Borthwick Road Tandem(Team Pro/B-67s Imperial)

    http://tickers.TickerFactory.com/ezt...Cqs/weight.png

  7. #7
    Senior Member
    Join Date
    Mar 2011
    Posts
    317
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    40/13 is quite a jump from 40/16. I can definitely see 40/16 being too easy, but I think 40/13 will be rough.

  8. #8
    Veteran Racer TejanoTrackie's Avatar
    Join Date
    Jul 2009
    Location
    Ciudad de Vacas, Tejas
    My Bikes
    28 frames + 73 wheels
    Posts
    7,735
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    My male appendage is bigger than your male appendage.
    What, Me Worry? - Alfred E. Neuman

    Quote Originally Posted by Dcv View Post
    I'd like to think i have as much money as brains.

  9. #9
    モㄥ工匕モ 爪モ爪乃モ尺 evilcryalotmore's Avatar
    Join Date
    Feb 2010
    Location
    LA San Gabriel, California
    My Bikes
    Custom frame
    Posts
    2,136
    Mentioned
    1 Post(s)
    Tagged
    0 Thread(s)
    Gearing is differnt for everyone, Depending on how strong you are, your position on the bike, tires, rim weight. Like everyone else says its pretty much a trial and error type thing,

    currently im using 48/16 I used to use a 17 cog, But since the switch i havent really noticed.

  10. #10
    Senior Member mikeetow's Avatar
    Join Date
    Jul 2009
    Location
    Hermosa Beach, CA
    Posts
    388
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by evilcryalotmore View Post
    Gearing is differnt for everyone, Depending on how strong you are, your position on the bike, tires, rim weight. Like everyone else says its pretty much a trial and error type thing,

    currently im using 48/16 I used to use a 17 cog, But since the switch i havent really noticed.
    but you just lost all yer skid patches dood!
    1991 Litespeed mtb
    1999 Litespeed Ultimate
    2011 Salsa Vaya
    2012 Ritchey Swiss Cross

    pedalroom
    http://www.pedalroom.com/member/mikeetow

  11. #11
    Senior Member
    Join Date
    Mar 2011
    Posts
    317
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by mikeetow View Post
    but you just lost all yer skid patches dood!
    He's still got 2! But for me, I think it would be zero cause I doubt I could lock up a 48/16.

  12. #12
    Knotty Guy Anthropy's Avatar
    Join Date
    Nov 2010
    Posts
    292
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    2 teeth can make a big difference in either direction. When you calculate your gear inches, think smaller number, easier to pedal, but you must pedal faster to go fast. Scrod here sells cogs for $16 plus $2 shipping, which is pretty reasonable and are good cogs. You could try out a couple and see what you want. I use 700c x 32 tires which gives me 42/16 (71 GI) and 42/18 (63). I had run 42/16 (liked), but knees were hurting, so I tried out 45/18 (67) for a few days and knees still hurt. Last couple of days I went back to 42/18 and have focused on spinning. Knees do not hurt right now.

    Doc said the area behind my patella is shot on both knees, so I have to watch it.


    Tom

  13. #13
    Senior Member EdIsMe's Avatar
    Join Date
    Mar 2011
    Location
    Floriduh
    My Bikes
    2011 Neuvation FC100, 2013 Mercier Kilo TT Pro, 1984 Peugeot SV-L
    Posts
    664
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    I've been using a 46x14 on 700x23c tires and Floriduh flat terrain. High enough to keep up with Roadies but still low enough to climb the bridges. I can skid with this gearing but almost never do. 86gi btw ...

  14. #14
    Senior Member Hartigan's Avatar
    Join Date
    Jun 2010
    Posts
    195
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    HTFU!!

    ... just kidding. I ride 52/19

    M.

  15. #15
    Senior Member
    Join Date
    Feb 2008
    Location
    UK
    Posts
    2,325
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Oh well this is embarrassing! I was told it was 42-18, but upon counting it (yes I should have done it before) it turns out it is 42-16. So I will be buying an 18t cog!

    Thanks

    Daven

  16. #16
    Knotty Guy Anthropy's Avatar
    Join Date
    Nov 2010
    Posts
    292
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    If you wanted just a little easier pedaling, consider a 17t cog. Otherwise 18 will make it a lot easier. You could get both and see what one you liked best.


    Tom

  17. #17
    Senior Member
    Join Date
    Jul 2009
    Location
    Chicago, Il
    My Bikes
    Self-built EightInch fixed-gear.
    Posts
    83
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Seeing ratio's this low is weird to me - the lowest person I know if 44x19. Loooove flatness.

    (On Topic) Maybe see if a local shop has a few cogs lying around to try out?

  18. #18
    Senior Member
    Join Date
    Feb 2008
    Location
    UK
    Posts
    2,325
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Found an 18t for 5.99 so bought it should be good and make me enjoy the bike much more (even though it is a beater!)

  19. #19
    Must... ride... more... Phil_gretz's Avatar
    Join Date
    Aug 2009
    Location
    Sterling, VA
    My Bikes
    '77 Fuji S-10S, '82 Fuji Team, '88 Fuji Saratoga, '08 Scattante CFR, '12 Jamis Sputnik, '13 Motobecane Fantom29 HT
    Posts
    2,390
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)

    61 gear inches? Too High?

    Maybe you're in a very hilly area? It seems that 61 gear inches is a pretty low gear for all around use. Wouldn't 70-75 be a more typical FG/SS number for general purpose riding?
    PG

  20. #20
    Schwinn Magnet 63_dorinte's Avatar
    Join Date
    Aug 2010
    Location
    Virginia
    Posts
    458
    Mentioned
    1 Post(s)
    Tagged
    0 Thread(s)
    FWIW, 42x18 is my normal setup, and there are a few hills that I just can't pedal up - I get to a point where I can't move the cranks anymore and have to get off or fall over. I also keep a 20T on the flip side for longer rides and off-days.

    I also run 42x18 on my S3X, that makes those hills rideable.

    Consider also that I live in the mountains where to get anywhere I have to go up. Maybe the OP's local terrain is similar.

Posting Permissions

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