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MTB frame that meets this criteria?

Old 08-02-22, 01:39 PM
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bikethis
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MTB frame that meets this criteria?

Hi guys,

I have a bit of a seemingly bizarre request. Does anyone know of a frame that meets this criteria:

Less than $300

Supports a front chainring size of 42 teeth

Horizontal sliding dropouts

I'm building a single speed mountain bike that I want to sort of act as a budget low end dirt jumper (for rather small urban jumps around my area.)

I've been looking and can't seem to find anything. The closest I got was the Octane Zircus One but unfortunately it only supports a chainring of up to 34T.

Many thanks.
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Old 08-02-22, 02:41 PM
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The Octane Zircus 1 doesn’t have sliding dropouts. Or do you just mean horizontal?
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Old 08-02-22, 04:09 PM
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Originally Posted by bikethis View Post
Hi guys,

I have a bit of a seemingly bizarre request. Does anyone know of a frame that meets this criteria:

Less than $300

Supports a front chainring size of 42 teeth

Horizontal sliding dropouts

I'm building a single speed mountain bike that I want to sort of act as a budget low end dirt jumper (for rather small urban jumps around my area.)

I've been looking and can't seem to find anything. The closest I got was the Octane Zircus One but unfortunately it only supports a chainring of up to 34T.

Many thanks.
Surly makes few different frames with rear track ends but it`s also going to cost more than $ 300...Kona Unit frame has sliding drop outs and may be a little cheaper than Surly...Salsa Fargo has drop outs that are designed to be used as a singlespeed or geared but Salsa frames are expensive.
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Old 08-02-22, 05:16 PM
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Why not get a complete? Or another brand equivalent. They have 10t rear cogs so a 34t front is appropriate, seems way higher than 55" bmx gear.
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Old 08-02-22, 05:37 PM
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BikesDirect has complete 26er SS/DJs starting at ~$350
It’s just past your “bare frame” budget, and saves you all the faffing about that it takes to make a working bike from random parts.

Save up to 60% off new Adult BMX ALL BIKES FREE SHIP 48 Save Up to 60% Off Gravity BMX Single Speed BMX Bikes, BMX Cruiser Bikes Fast, Strong and Lightweight Aluminum Frames
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Old 08-03-22, 05:01 AM
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Mountain bike frames and 42t chainrings don't go together. The short chainstays and wide tire clearance requirements of modern MTB frames, doesn't leave enough room for chainrings that large. I have built(welded together) a number of MTB frames and its always a challenge fitting the chainstay between the tire and the chainring. On the plus tire (3" tire clearance) frames that I build, a 32t chainring is the max. that will fit.

By the way, quality sliding or rocker dropouts cost me around $150, which is around the same cost as the rest of the frame tubes, head tube and bottom bracket. It would cost me over $300 in raw materials to build that frame and that doesn't include powder coating it or me making any money from it.
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Old 08-03-22, 06:27 AM
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"Criteria" is a plural, therefore "...these criteria..," not "...this criteria..."
The singular is "criterion", i.e. "...this criterion..."

No Schoolhouse Rock for this one, maybe should have been "I'm just a criterion. Yes, I'm only a criterion, not a list or table..."
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Old 08-03-22, 07:46 AM
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What’s the singular noun form of “pedantic”?
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Old 08-03-22, 08:32 AM
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Originally Posted by dsaul View Post
Mountain bike frames and 42t chainrings don't go together. The short chainstays and wide tire clearance requirements of modern MTB frames, doesn't leave enough room for chainrings that large. I have built(welded together) a number of MTB frames and its always a challenge fitting the chainstay between the tire and the chainring. On the plus tire (3" tire clearance) frames that I build, a 32t chainring is the max. that will fit.

By the way, quality sliding or rocker dropouts cost me around $150, which is around the same cost as the rest of the frame tubes, head tube and bottom bracket. It would cost me over $300 in raw materials to build that frame and that doesn't include powder coating it or me making any money from it.
ss dirt jumper, man. The only question is why he feels he needs the 42
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Old 08-03-22, 08:38 AM
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Originally Posted by bikethis View Post
Hi guys,
Less than $300
Have you looked at Walmart?
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Old 08-03-22, 08:41 AM
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Originally Posted by prj71 View Post
Have you looked at Walmart?
Unfortunately we don't have those in England and the sort of equivalent only sell prebuilt bikes - not induvidual frames.
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Old 08-03-22, 08:46 AM
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Then you need to realize that less than $300 doesn't get you much.
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Old 08-03-22, 08:57 AM
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I honestly don’t know the difference between a 26” wheel dirt jumper vs a 26” BMX. Maybe wheelbase? I’m not sure either of them are bikes you would ride any distance at speed.

42t chainring on a 26er was the standard outer ring on mtb’s decades ago. Unfortunately the geometry will probably be less than ideal. But if you can run a chainline off an outer ring using an older triple, I would think you could get there. The biggest issue is the dropout width.

I’d probably look at 26” BMX frames and see how far outboard I could run the 14t cog.

dsaul is right about never finding/building a mtb, or dirt jumper, with a 42t because you will never clear the chainstay. You have to move the chainring out. Therein lies the chainline issue.

John
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Old 08-03-22, 09:42 AM
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Originally Posted by 70sSanO View Post
I honestly don’t know the difference between a 26” wheel dirt jumper vs a 26” BMX. Maybe wheelbase? I’m not sure either of them are bikes you would ride any distance at speed.
Looking at a few, the dj bike has a tighter rear triangle, suspension fork giving a lot of stack so it uses a flat bar, and a seat with no pretense you'll ever be sitting on it.
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Old 08-03-22, 10:00 AM
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Originally Posted by Rolla View Post
What’s the singular noun form of “pedantic”?
In his case, it’s “French shower bag.”
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Old 08-03-22, 01:30 PM
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Originally Posted by Rolla View Post
What’s the singular noun form of “pedantic”?
Pedant.
Duh!
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Old 08-03-22, 02:05 PM
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Originally Posted by Rolla View Post
What’s the singular noun form of “pedantic”?
Pedantic is an adjective not a noun
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Old 08-03-22, 02:53 PM
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Originally Posted by alcjphil
Pedantic is an adjective not a noun
Yes, and its noun form is pedant, hence my post. 💡

Last edited by Rolla; 08-03-22 at 03:22 PM.
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Old 08-03-22, 02:59 PM
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Originally Posted by noimagination;
Pedant. Duh!
And there you are. You and Phil should start a club.

Last edited by Rolla; 08-03-22 at 03:24 PM.
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Old 08-03-22, 03:22 PM
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Originally Posted by Rolla View Post
And there you are. You and Phil should start a club.
"I refuse to join a club that would have me as a member." Karl Groucho Marx
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Old 08-03-22, 03:47 PM
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Originally Posted by noimagination;
"I refuse to join a club that would have me as a member." Karl Groucho Marx
User name checks out.
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Old 08-03-22, 04:05 PM
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Fueler frame (gtbicycles.com)
It's BMX but it might work?
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Old 08-03-22, 05:04 PM
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Originally Posted by Darth Lefty View Post
ss dirt jumper, man. The only question is why he feels he needs the 42
Because it’s a 26er. He’s running 42x14, which is about right for a street fixie, but a little steep for the trail. (I’m running a 40t on my Klunker, but 1x6 because SunTour)
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