I am thinking about getting this frameset for my next MB project. It is a Dirt Jumping frame for MTB size wheels (26" aka 559) & looks very heavy duty @ around 6 lbs.
Opinions welcome
Opinions welcome
What do you think of this frame for an MB?
- Thread starter lowracer
- Start date
ocscully
Member
There does not appear to be any room to mount a motor in the frame shown?
ocscully
ocscully
RedBaronX
Member
right-- that is a crazy beefy looking frame, but there is not enough space for a in-frame mounted motor. Put a rack mount on that and you would be unstoppable though.
lowracer
Member
Oh yeah, Sorry I forgot to mention that it will be a front drive belt drive (kinda like my current MB) but with a bigger engine. Here are some pics of the items going on it & a pic of a fellow MB'er bike that I drew inspiration from.
I just put together the front wheel, Whizzer sheave & Marzocchi Bomber fork from stuff I had laying around the garage. This wheel is actually a single speed rear wheel (no dish), that I removed the quick release axle & installed a solid axle. The extra length will be perfect to attach the vertical steel mounting hardware for the front engine rack that will be fabricated w/ 3/4" steel square section to hold the Lifan 2.5 hp 4 stroke.
-lowracer-
I just put together the front wheel, Whizzer sheave & Marzocchi Bomber fork from stuff I had laying around the garage. This wheel is actually a single speed rear wheel (no dish), that I removed the quick release axle & installed a solid axle. The extra length will be perfect to attach the vertical steel mounting hardware for the front engine rack that will be fabricated w/ 3/4" steel square section to hold the Lifan 2.5 hp 4 stroke.
-lowracer-
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lowracer
Member
Ok,
I got the new engine ordered on eBay for $90
I got the new bicycle frame ordered on eBay for $90
I got a nice used Comet pulley clutch ordered for $40
Hardware from Lowes & my local Ace Hardware for $30
The rest of the bike parts I already had to complete the build.
Will post pics as parts start arriving.
This is getting a bit too addicting...lol
-lowracer-
I got the new engine ordered on eBay for $90
I got the new bicycle frame ordered on eBay for $90
I got a nice used Comet pulley clutch ordered for $40
Hardware from Lowes & my local Ace Hardware for $30
The rest of the bike parts I already had to complete the build.
Will post pics as parts start arriving.
This is getting a bit too addicting...lol
-lowracer-
Last edited:
lowracer
Member
Got most of my parts delivered & have been working on the engine mount. Here are a few new pics of the build in progress.
-lowracer-
-lowracer-
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wheelbender6
Well-Known Member
That RM frame looks indestructible. Why do you prefer the front mount?
So it doesn't interfere with your ability to pedal?
So it doesn't interfere with your ability to pedal?
lowracer
Member
wheelbender6,
I installed my Subaru Robin engine on a rear rack once before to see how I'd like rear drive & as a test bed for comparison reasons. It stayed on for a few days of riding & I came to the conclusion that I like front drive far more. The weight distribution & handling is better with the weight of the engine on the front wheel driving the steering thru turns. I also like the fact that the rear pedal drive is totally independent of the motored drivetrain. The cable run to the throttle is very short & if I need to reach forward to choke the engine its easy to do while moving. The biggest reason I prefer front drive is the stealth. When cars are behind me, they dont see a motored bike, just a bike going fast with no pedals turning. They see a bike like any other since the motor is on the front. I also like to see & hear what the engine is doing. I had alot of heat on my butt having the engine mounted on the rear directly above the wheel, & while standing on the pedals to pedal, the weight was all wrong.
-lowracer-
I installed my Subaru Robin engine on a rear rack once before to see how I'd like rear drive & as a test bed for comparison reasons. It stayed on for a few days of riding & I came to the conclusion that I like front drive far more. The weight distribution & handling is better with the weight of the engine on the front wheel driving the steering thru turns. I also like the fact that the rear pedal drive is totally independent of the motored drivetrain. The cable run to the throttle is very short & if I need to reach forward to choke the engine its easy to do while moving. The biggest reason I prefer front drive is the stealth. When cars are behind me, they dont see a motored bike, just a bike going fast with no pedals turning. They see a bike like any other since the motor is on the front. I also like to see & hear what the engine is doing. I had alot of heat on my butt having the engine mounted on the rear directly above the wheel, & while standing on the pedals to pedal, the weight was all wrong.
-lowracer-
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lowracer
Member
lowracer
Member
I installed the front brake & got the motor mount just about finished today.
I'm using 2 old school 1/2" skateboard truck riser pads made out of heavy rubber.
The 4 engine bolts will go thru these riser pads & it will absord alot of vibration. I ran this Lifan 152F (97cc) engine on the concrete to see how she sounded & it purrs like a kitten. Here is a pic of the pads.
-lowracer-
I'm using 2 old school 1/2" skateboard truck riser pads made out of heavy rubber.
The 4 engine bolts will go thru these riser pads & it will absord alot of vibration. I ran this Lifan 152F (97cc) engine on the concrete to see how she sounded & it purrs like a kitten. Here is a pic of the pads.
-lowracer-
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