Pedal thread sizes
#1
Senior Member
Thread Starter
Join Date: Sep 2008
Location: NE Tennessee
Posts: 917
Bikes: Giant TCR/Surly Karate Monkey/Foundry FireTower/Curtlo Tandem
Mentioned: 4 Post(s)
Tagged: 0 Thread(s)
Quoted: 169 Post(s)
Liked 84 Times
in
62 Posts
Pedal thread sizes
I own an older Schwinn exercise bike that has pedals with wide straps across the top to help keep your feet on the pedals. They work well but I am wanting to replace them with a spare set of Shimano road pedals that I have laying around. The problem that I have run into is that the diameter of the Shimano pedals (9/16" x 20 tpi) is larger than hole in the crank arm.
The way I see it, to swap out the pedals I have 4 options.
Drill and retap the holes (1 CW and 1 CCW).
Replace the crank assembly.
Find a pedal with the smaller diameter shaft.
Live with it the way that it is.
I need to learn to search better. The older is 1/2"x20tpi
https://www.bikeforums.net/archive/in...p/t-28349.html
The way I see it, to swap out the pedals I have 4 options.
Drill and retap the holes (1 CW and 1 CCW).
Replace the crank assembly.
Find a pedal with the smaller diameter shaft.
Live with it the way that it is.
I need to learn to search better. The older is 1/2"x20tpi
https://www.bikeforums.net/archive/in...p/t-28349.html
Last edited by bakerjw; 11-10-08 at 07:29 AM.
#2
Thrifty Bill
Join Date: Jan 2008
Location: Mountains of Western NC
Posts: 23,523
Bikes: 86 Katakura Silk, 87 Prologue X2, 88 Cimarron LE, 1975 Sekai 4000 Professional, 73 Paramount, plus more
Mentioned: 96 Post(s)
Tagged: 0 Thread(s)
Quoted: 1236 Post(s)
Liked 964 Times
in
628 Posts
I think they use 1/2 inch pedal size. Most exercise bikes are that size. You can find simple 1/2 inch pedals at Walmart. Nashbar and others also sell 1/2 inch pedals. Or you can find standard exercise bike pedals on ebay.
I personally would not be drilling and taping the crank arms. #1: Its a lot of work. #2 It weakens the crank arms. #3. Its a lot of work.....
I personally would not be drilling and taping the crank arms. #1: Its a lot of work. #2 It weakens the crank arms. #3. Its a lot of work.....
#3
rebmeM roineS
Join Date: Jan 2006
Location: Metro Indy, IN
Posts: 16,216
Bikes: Bacchetta Giro A20, RANS V-Rex, RANS Screamer
Mentioned: 15 Post(s)
Tagged: 0 Thread(s)
Quoted: 653 Post(s)
Liked 347 Times
in
226 Posts
I have seen references to higher-quality 1/2" pedals.
https://www.bikeforums.net/showthread...ght=pedals+1/2
https://www.bikeforums.net/showthread...ght=pedals+1/2
#4
Senior Member
Join Date: Oct 2005
Location: Fresno, CA
Posts: 4,454
Mentioned: 6 Post(s)
Tagged: 0 Thread(s)
Quoted: 128 Post(s)
Likes: 0
Liked 12 Times
in
10 Posts
I'd also recommend getting some kind of 1/2" pedals and putting toeclips on them and using the bike as-is.
If you're okay with the pedals sitting a bit further away from the crankarms (q-factor) you can get 9/16 to 1/2 adapters
https://sheldonbrown.com/harris/pedals.html
If you're okay with the pedals sitting a bit further away from the crankarms (q-factor) you can get 9/16 to 1/2 adapters
https://sheldonbrown.com/harris/pedals.html
__________________
"c" is not a unit that measures tire width
"c" is not a unit that measures tire width
#5
Insane Bicycle Mechanic
Join Date: Mar 2008
Location: other Vancouver
Posts: 9,827
Mentioned: 34 Post(s)
Tagged: 0 Thread(s)
Quoted: 797 Post(s)
Liked 695 Times
in
372 Posts
It's possible to replace the cranks with a conversion bottom bracket and 3-piece cranks, but the chainring on the old Schwinn Exercisers was huge- something like 60 teeth. These are available for recumbents and downhill bikes, but it's a pricey proposition.
__________________
Jeff Wills
Comcast nuked my web page. It will return soon..
Jeff Wills
Comcast nuked my web page. It will return soon..
#6
Newbie
Join Date: Jan 2008
Location: Fresno, Ca.
Posts: 3
Bikes: Look 555
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times
in
0 Posts
Or you can get a set of these <https://www.bikemania.biz/Bicycle_Pedals_s/50.htm> pedal adapters. They are about half way down the page. It allows you to use 9/16 pedals on 1/2 crank arms. I used them on my schwinn. They do move the pedals out a little but not bad.