Advertise on Bikeforums.net



User Tag List

Results 1 to 12 of 12
  1. #1
    B17
    B17 is offline
    Senior Member
    Join Date
    Apr 2005
    Posts
    278
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)

    700c v. 27" and pedal strike

    I just got home with a Nishiki Olympic 12 frame- $20 for the entire bike minus the rear wheel. The lugwork on the headtube and the headbadge made me want it. But the wheel that came with the bike is a 27". If I choose to fix this bike, can I expect any pedal strike issues from the BB being 4mm closer to the ground? I know it sounds like a small distance, but it's an honest concern, so I'm asking. Thanks.

  2. #2
    Cornucopia of Awesomeness baxtefer's Avatar
    Join Date
    Oct 2004
    Location
    not where i used to be
    Posts
    4,847
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    counteract the 4mm drop by going with 5mm shorter cranks.

  3. #3
    Sheldon Certified Jaminsky's Avatar
    Join Date
    Jan 2005
    Location
    San Francisco And Crimebridge
    My Bikes
    '81 Bianchi road/track conversion, certified by Sheldon
    Posts
    203
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Isn't it more like a 7mm drop? But I wouldn't expect it would actually be a problem, even with the cranks you have now.

  4. #4
    Cornucopia of Awesomeness baxtefer's Avatar
    Join Date
    Oct 2004
    Location
    not where i used to be
    Posts
    4,847
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    well, the drop depends on the tires you pick, but really you're dealing with a 630mm bead seat diameter on the 27's and a 622mm diameter on the 700's.

    so the drop will be around 4mm

  5. #5
    B17
    B17 is offline
    Senior Member
    Join Date
    Apr 2005
    Posts
    278
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Thanks for the replies. This frame has long stays (made a bit longer by the use of 700c wheels and tires), and uses those old-style Weinmann center-pull brakes, so I'm not looking to make it look like a racer. It'll likely have 32 or 35mm tires, fenders and my username atop the seatpost.

    Crankset will be 165mm. I figure 32 or 35mm on the tires is enough to offset any distance I lose not going any shorter than that on the crankarms.

  6. #6
    Banned.
    Join Date
    Oct 2004
    Posts
    4,418
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    With 32+mm tires, you won't have any issues with pedal strike. Run whatever length crank you have on there now.

  7. #7
    MADE IN HONG KONG
    Join Date
    Aug 2005
    Location
    Washington DC
    My Bikes
    some but not enough
    Posts
    1,763
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    just a though, if you are going to run brakes....do you have enough reach with the brakes? When I converted my (possibly same era) nishiki from 27 to 700, it was hard to find brakes and the weiman center pulls did not reach the rims. I ended up installing a 700 fork and making up my own "drop" installation for the rear.
    If you are not having any fun, it's all your fault

  8. #8
    MADE IN HONG KONG
    Join Date
    Aug 2005
    Location
    Washington DC
    My Bikes
    some but not enough
    Posts
    1,763
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    btw; have not grounded with 165's ....but just waiting for the day
    If you are not having any fun, it's all your fault

  9. #9
    information sponge
    Join Date
    Feb 2005
    Location
    Little Village, Chicago, IL
    My Bikes
    Lots. Mostly steel. Mostly heavy. Mostly geared, and very low, at that.
    Posts
    692
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by poopncow
    just a though, if you are going to run brakes....do you have enough reach with the brakes? When I converted my (possibly same era) nishiki from 27 to 700, it was hard to find brakes and the weiman center pulls did not reach the rims. I ended up installing a 700 fork and making up my own "drop" installation for the rear.

    those old Weinmann brakes come in multiple lengths. I've seen some REALLY long ones. Personally, short of the Paul "new racer" brakes, I think they're the best option for converting a bike to 700 from 27". They stop SO much better than side-pulls of equivalent length.
    Philosophy and feelings don't change the laws of physics

  10. #10
    brain damaged bovine muccapazza's Avatar
    Join Date
    Feb 2005
    Location
    back on the dental floss ranch, wielding zircon encrusted tweezers
    My Bikes
    Schwinn wrecked ol' Probe 1x2, 84 Bianchi Limited,Cannondale F400,Raleigh 20 folder,78 Schwinn LeTour III Fixed Gear,Redline Conquest Pro,71-73 Gitane TdF,Gitane Grand Sport de Luxe,78 Raleigh Super Course,80 Schwinn World Sport
    Posts
    625
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by treechunk
    those old Weinmann brakes come in multiple lengths. I've seen some REALLY long ones. Personally, short of the Paul "new racer" brakes, I think they're the best option for converting a bike to 700 from 27". They stop SO much better than side-pulls of equivalent length.
    Good idea. Mafac Racers have a pretty long reach, too.

  11. #11
    Junior Member
    Join Date
    Oct 2005
    Posts
    15
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    can u weld on center pul braz ons to old frames

  12. #12
    information sponge
    Join Date
    Feb 2005
    Location
    Little Village, Chicago, IL
    My Bikes
    Lots. Mostly steel. Mostly heavy. Mostly geared, and very low, at that.
    Posts
    692
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by pdxbikelover
    can u weld on center pul braz ons to old frames

    you mean cantilever? http://sheldonbrown.com/gloss_ca-g.html#cantilever

    Center-pull brakes are slightly different. http://sheldonbrown.com/gloss_ca-g.html#center-pull



    If you mean cantilever, you certainly CAN, but it's not necessarily easy to get them lined up straight if you don't know what you're doing. I've seen a set or two that were added on to an older bike that were off at weird angles and basically left the frame not-so-useable.
    Philosophy and feelings don't change the laws of physics

Posting Permissions

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