Pedal thread sizes
11-10-08 | 07:21 AM
#1
Thread Starter
Senior Member
Joined: Sep 2008
Posts: 917
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From: NE Tennessee
Bikes: Giant TCR/Surly Karate Monkey/Foundry FireTower/Curtlo Tandem
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.
11-10-08 | 07:32 AM
#2
Thrifty Bill
Joined: Jan 2008
Posts: 23,639
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From: Mans of NC & SW UT Desert
Bikes: 86 Katakura Silk, 87 Prologue X2, 88 Cimarron LE, 1975 Sekai 4000 Professional, 73 Paramount, plus more
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.....
11-10-08 | 08:14 AM
#3
rebmeM roineS
Joined: Jan 2006
Posts: 16,230
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From: Metro Indy, IN
Bikes: Bacchetta Giro A20, RANS V-Rex, RANS Screamer
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
11-10-08 | 10:32 AM
#4
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
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11-10-08 | 07:31 PM
#5
Insane Bicycle Mechanic
Joined: Mar 2008
Posts: 10,152
Likes: 1,119
From: other Vancouver
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.
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11-11-08 | 08:06 AM
#6
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Joined: Jan 2008
Posts: 3
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From: Fresno, Ca.
Bikes: Look 555
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.
