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Do I need a 1" or 1 1/8" stem for a 2008 Diamondback Outlook MTB?

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Do I need a 1" or 1 1/8" stem for a 2008 Diamondback Outlook MTB?

Old 03-15-11, 08:11 PM
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ghostm42
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Do I need a 1" or 1 1/8" stem for a 2008 Diamondback Outlook MTB?

This is a pretty silly question, but I don't want to buy the wrong item. I have a Diamondback Outlook without a stem or any steering components. I've fixed up several road bikes and have only encountered 1" threaded headsets and 1 1/8" threadless headsets. I've never worked on a mountain bike before. From what I can gather, this MTB uses a 1 1/8" threaded headset, which I've never seen before.

I measured the inner diameter of the steering tube and noticed it was 1" in diameter. Checking with Sheldon Brown, it does appear that 1 1/8" threaded headsets have a 1" inner diameter.
https://www.sheldonbrown.com/gloss_ha-i.html

So, when I buy a quill stem online, am I supposed to buy a 1" one or a 1 1/8" one? I'm guessing a 1 1/8" one. As if it's not confusing enough, the 1 1/8" ones are usually labelled 25.4mm.... which is equal to 1". Is this right?
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Old 03-15-11, 08:43 PM
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See https://bikepedia.com/QuickBike/BikeS...look&Type=bike
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Old 03-15-11, 09:12 PM
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Originally Posted by ghostm42 View Post
So, when I buy a quill stem online, am I supposed to buy a 1" one or a 1 1/8" one? I'm guessing a 1 1/8" one. As if it's not confusing enough, the 1 1/8" ones are usually labelled 25.4mm.... which is equal to 1". Is this right?
Yeah, 1 1/8" threaded is a little rare, they're out there though.

You'll need a 1 1/8" stem. The 25.4mm you're seeing is likely the stem clamp diameter. You need to match this to your handlebars. Unfortunately Bikepedia doesn't have this info. Chances are very good that your bars are 25.4.

25.4 and 31.8 are the two sizes that cover almost all MTB stem/bars out there. It's pretty easy to tell the difference if you're used to 25.4. If not, snap a pic and someone could probably tell by looking.
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Old 03-15-11, 10:55 PM
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Indeed, now that I look more carefully, the 25.4mm does refer to the stem clamp. And indeed, my handlebars clamp diameter is 25.4mm.

Unfortunately, the 1 1/8" quill stem does not seem to be common at all.
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Old 03-15-11, 11:13 PM
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QBP carries several 1 1/8 quill stems in the $20-$50 range. Most any bike shop could special order those for you.
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Old 03-15-11, 11:25 PM
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You could also Get a quill to threadless stem adapter,
It will let you use More common threadless stems
there are the same pieces in 7/8''-22,2mm,
and 1''-25.4mm so get the right one.

It's a quill that you then would clamp on a threadless stem, onto.

see typical item picture in #8 most any Bike shop can get one,
(shipping included, rather than an extra charge)

Last edited by fietsbob; 03-16-11 at 08:48 AM.
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Old 03-16-11, 04:18 AM
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Bikpedia says 1 1/8, this sounds right, as most MTB's from the early 90's have had 1 1/8, and Ahead since 95/96.

How much needs to be replaced? as this was a low end bike, and you could quickly spend more on a few bits than the cost of a new bike.
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Old 03-16-11, 04:29 AM
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Here's an inexpensive solution https://www.nashbar.com/bikes/Product...1_10000_202347
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Old 03-16-11, 05:08 PM
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Originally Posted by jimc101 View Post
How much needs to be replaced? as this was a low end bike, and you could quickly spend more on a few bits than the cost of a new bike.
Initially, I didn't think it needed too much since the frame is in great condition and I have some spare parts. Now I'm starting to wonder. It needs the quill/stem, handlebars, brake levers, shifters, cabling, seatpost, seatpost clamp, saddle and a 26" tire. I have cabling, handlebars and a threadless stem. I have a bunch of 7-speed shifters (downtube/stem shifters, grip shifters) that I thought would work, but then I realized the rear wheel has a 6-speed freewheel. Must not be stock. So now I have to decide whether to get 6-speed shifters or a 7-speed freewheel. I don't mind friction shifters, but I'll probably give the bike away after it's built and I'm sure whoever gets it will prefer index shifters. If this goes above $40 in costs, I'll probably scrap it or sell off any remaining parts on it.
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Old 03-16-11, 05:38 PM
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This was a 220 dollar bike new. At this point it's worth about a 100 minus the cost of repairs. If you got good use out of it, you got your money's worth already IMO. Just passing it along to a deserving person for the parts seems like the best way to go.
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