stem size?
12-15-12 | 11:40 AM
#1
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stem size?
Hello,
I am helping my Dad convert his road bike into a sort of hybrid. I want to replace the handlebars with a flat bar, but am not sure what size the stem is (I have to start this process remotely). He sent this photo. It's an 80s-era Cannondale. I assume this is obvious to anyone who knows even a little bit about this -- thanks very much for any help!
Josh
I am helping my Dad convert his road bike into a sort of hybrid. I want to replace the handlebars with a flat bar, but am not sure what size the stem is (I have to start this process remotely). He sent this photo. It's an 80s-era Cannondale. I assume this is obvious to anyone who knows even a little bit about this -- thanks very much for any help!
Josh
12-15-12 | 11:54 AM
#2
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From: New Rochelle, NY
Bikes: too many bikes from 1967 10s (5x2)Frejus to a Sumitomo Ti/Chorus aluminum 10s (10x2), plus one non-susp mtn bike I use as my commuter
You need a standard quill stem for a 1" fork. The diameter of the stem itself is 7/8" to match the ID of the fork.
The clamp diameter will match the diameter of the bar you propose buying, most likely 1" or 25.4mm (same thing).
These are standard items and you should have no problem finding the right bar/stem combo.
The clamp diameter will match the diameter of the bar you propose buying, most likely 1" or 25.4mm (same thing).
These are standard items and you should have no problem finding the right bar/stem combo.
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FB
Chain-L site
An ounce of diagnosis is worth a pound of cure.
Just because I'm tired of arguing, doesn't mean you're right.
“One accurate measurement is worth a thousand expert opinions” - Adm Grace Murray Hopper - USN
WARNING, I'm from New York. Thin skinned people should maintain safe distance.
Last edited by FBinNY; 12-15-12 at 12:09 PM.
12-15-12 | 01:09 PM
#6
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From: New Rochelle, NY
Bikes: too many bikes from 1967 10s (5x2)Frejus to a Sumitomo Ti/Chorus aluminum 10s (10x2), plus one non-susp mtn bike I use as my commuter
Just about every straight bar has a 1" clamp. But only drop bars from Japan or Taiwan use that size. The more common drop bar clamp br clamp diameter is 26mm and straight bars of that diameter are rare.
Measure your bar's diameter in the bulge area just outside the stem. You don't need a precise measurement, since you're only trying to confirm if it's 1" or larger (the stems brand might also be a guide). If you don't have a caliper make a gauge by cutting a dovetail shaped notch in a piece of cardboard, then carefully cutting the open to exactly 1" as measured on a ruler. You should end up with a sort of "C" cutout which will either just fit over the bar, or be too small.
Odds are you'll need both a bar and stem for the conversion, but you may luck out.
__________________
FB
Chain-L site
An ounce of diagnosis is worth a pound of cure.
Just because I'm tired of arguing, doesn't mean you're right.
“One accurate measurement is worth a thousand expert opinions” - Adm Grace Murray Hopper - USN
WARNING, I'm from New York. Thin skinned people should maintain safe distance.
FB
Chain-L site
An ounce of diagnosis is worth a pound of cure.
Just because I'm tired of arguing, doesn't mean you're right.
“One accurate measurement is worth a thousand expert opinions” - Adm Grace Murray Hopper - USN
WARNING, I'm from New York. Thin skinned people should maintain safe distance.
Last edited by FBinNY; 12-15-12 at 01:12 PM.
12-15-12 | 01:13 PM
#7
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Chances are pretty good it's a 26mm bar clamp. If he wants upright I'd go ahead and get an olde MTB stem with a little rise to it. If you have good used parts shops around you can usually get 'em for $5 or less.
Make sure you get brake levers for canti brakes, v-brake levers won't work as well. Hmmm, actually I don't think I've tried V-brake levers on old road calipers before, but I imagine they wouldn't work very well.
Make sure you get brake levers for canti brakes, v-brake levers won't work as well. Hmmm, actually I don't think I've tried V-brake levers on old road calipers before, but I imagine they wouldn't work very well.
12-15-12 | 01:14 PM
#8
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No I didn't. Aluminum drop bars typically have a different clamp diameter than straight bars.
Just about every straight bar has a 1" clamp. But only drop bars from Japan or Taiwan use that size. The more common drop bar clamp br clamp diameter is 26mm and straight bars of that diameter are rare.
Measure your bar's diameter in the bulge area just outside the stem. You don't need a precise measurement, since you're only trying to confirm if it's 1" or larger (the stems brand might also be a guide). If you don't have a caliper make a gauge by cutting a dovetail shaped notch in a piece of cardboard, then carefully cutting the open to exactly 1" as measured on a ruler. You should end up with a sort of "C" cutout which will either just fit over the bar, or be too small.
Odds are you'll need both a bar and stem for the conversion, but you may luck out.
Just about every straight bar has a 1" clamp. But only drop bars from Japan or Taiwan use that size. The more common drop bar clamp br clamp diameter is 26mm and straight bars of that diameter are rare.
Measure your bar's diameter in the bulge area just outside the stem. You don't need a precise measurement, since you're only trying to confirm if it's 1" or larger (the stems brand might also be a guide). If you don't have a caliper make a gauge by cutting a dovetail shaped notch in a piece of cardboard, then carefully cutting the open to exactly 1" as measured on a ruler. You should end up with a sort of "C" cutout which will either just fit over the bar, or be too small.
Odds are you'll need both a bar and stem for the conversion, but you may luck out.
12-15-12 | 01:14 PM
#9
The space coyote lied.
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No I didn't. Aluminum drop bars typically have a different clamp diameter than straight bars.
Just about every straight bar has a 1" clamp. But only drop bars from Japan or Taiwan use that size. The more common drop bar clamp br clamp diameter is 26mm and straight bars of that diameter are rare.
Measure your bar's diameter in the bulge area just outside the stem. You don't need a precise measurement, since you're only trying to confirm if it's 1" or larger (the stems brand might also be a guide).
Just about every straight bar has a 1" clamp. But only drop bars from Japan or Taiwan use that size. The more common drop bar clamp br clamp diameter is 26mm and straight bars of that diameter are rare.
Measure your bar's diameter in the bulge area just outside the stem. You don't need a precise measurement, since you're only trying to confirm if it's 1" or larger (the stems brand might also be a guide).
Cannondale started specing Nittos in 1985, it looks like, and they were paired with Belleri bars which I'd guess were 26.0. Seems like Cannondale would've went for the "fancier" 26.0.
Last edited by LesterOfPuppets; 12-15-12 at 01:21 PM.
12-15-12 | 01:25 PM
#10
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How tall is your dad? That is a huge bike and probably has a long top-tube as well, which means for an upright position the existing stem with ~10 cm of forward extension is working against your goal.
FOr maximum choice to stems the best thing is to get a 22.2mm quill-to-threadless adapter, which will allow the use of modern clamp-on stems... which every LBS has 100s of in stock.
FOr maximum choice to stems the best thing is to get a 22.2mm quill-to-threadless adapter, which will allow the use of modern clamp-on stems... which every LBS has 100s of in stock.
12-15-12 | 01:28 PM
#11
The space coyote lied.
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There are so many cheap, old MTB stems with lotsa rise/little extension to choose from though...
2012-12-08_13-17-14_157 by Lester.L., on Flickr
2012-12-08_13-17-14_157 by Lester.L., on Flickr
12-15-12 | 01:36 PM
#12
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How tall is your dad? That is a huge bike and probably has a long top-tube as well, which means for an upright position the existing stem with ~10 cm of forward extension is working against your goal.
FOr maximum choice to stems the best thing is to get a 22.2mm quill-to-threadless adapter, which will allow the use of modern clamp-on stems... which every LBS has 100s of in stock.
FOr maximum choice to stems the best thing is to get a 22.2mm quill-to-threadless adapter, which will allow the use of modern clamp-on stems... which every LBS has 100s of in stock.
Good point. He's 6' tall, and as far as I know the bike fits him well, but point taken about the long extension. I didn't want to have to deal with a new stem but seems that may be the best option.
12-16-12 | 12:19 AM
#15
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QBP has a nice quill stem and the angle is adjustable and takes a 1" bar clamp,
common to most straight and trekking bars , then you need the brake levers ,
and to relocate the shift levers Too. so cables, 4, and housing must be purchased.
seem too much, drop it off at the bike shop and say 'make it so' ..
common to most straight and trekking bars , then you need the brake levers ,
and to relocate the shift levers Too. so cables, 4, and housing must be purchased.
seem too much, drop it off at the bike shop and say 'make it so' ..
12-16-12 | 02:25 PM
#16
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So would the 1" version of this do the trick?: https://www.nashbar.com/bikes/Product...88_-1___202439
12-16-12 | 02:35 PM
#17
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So would the 1" version of this do the trick?: https://www.nashbar.com/bikes/Product...88_-1___202439
Just be sure to keep the original bars/stem/brake levers as they belong with the bike. It's a shame when a flat bar conversion is done and the original parts are gone.
12-16-12 | 02:41 PM
#18
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Yeah, I will. I ride the bike sometimes when I'm home and it still is a really nice ride.
