Fastest mountain bike I have built!

bobo60

New Member
Nov 23, 2019
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This is a reply to those who fear using lightweight aluminum frames due to cracking issues.
I bought a used Diamondback Outlook mountain bike. All aluminum frame and as light as my road bikes.
I put a Zeda Firestorm YD100 kit fromBicycle-engines.com on it and it will hit 54mph on a
flat road for almost 2 miles. The YD is a torque monster, so even with a 36t rear sprocket, You can take off from a
standing start with little or no clutch slippage. It goes up hills and grades without missing a beat, and is
fun on the trails as well as the road. Here also is a video of it going on the street, and a spin on a local bike trail,
and then on the expressway.
20200630_205049 (1).jpg
 
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MoonLitCreeper

New Member
Aug 7, 2020
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Nice bike,
Debating on motorizing my cannondale killer v500.. Its pinky weight and made with aerospace aluminum.. Would probably be better than my fuji mx600 series.. But the frame on the cannondale is really thick so id need bigger motor mounts, which i dont have atm. But its a sound idea lol
 

Sidewinder Jerry

Well-Known Member
Dec 19, 2011
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Rockwood, TN
This is a reply to those who fear using lightweight aluminum frames due to cracking issues.
I bought a used Diamondback Outlook mountain bike. All aluminum frame and as light as my road bikes.
I put a Zeda Firestorm YD100 kit fromBicycle-engines.com on it and it will hit 54mph on a
flat road for almost 2 miles. The YD is a torque monster, so even with a 36t rear sprocket, You can take off from a
standing start with little or no clutch slippage. It goes up hills and grades without missing a beat, and is
fun on the trails as well as the road. Here also is a video of it going on the street, and a spin on a local bike trail,
and then on the expressway. View attachment 106321
Can't tell from the pictures where's your speedometer or bicycle computer? Only looks like a cellphone is on it.
 

Nightster

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Mar 3, 2021
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Can be as much as +/- 10 mph.
I’ve used several apps in a truck before and found them to be within 1 to 2 mph. wish I could remember the main one I used to use. Got a new phone recently and will have to go find it. Not saying they are great, just my experience wasn’t bad.
 

Nightster

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Mar 3, 2021
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Here’s the one I used to use:

Speed HUD

For IOS:

 

Sidewinder Jerry

Well-Known Member
Dec 19, 2011
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Rockwood, TN
Here’s the one I used to use:

Speed HUD

For IOS:

Bicycle computers are cheap and much more accurate. Most generally require a millimetre circumference entry. Simply put a level on your front tire and measure to the ground for the true diameter. Mine is actually 26 1/4". Multiply by ⚻. If you took the measurement in inches divide the circumference in inches by 25.4. Then enter that number into your bicycle computer.

Example:

26.25 × ⚻ ÷ 25.4 = 2095
 
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Nightster

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BTW, I tried the speed HUD app on the way home last night. It was off by 2 mph, in the current truck I was driving. I find vehicle speedometer‘s not to be accurate amongst each either also.
 

Sidewinder Jerry

Well-Known Member
Dec 19, 2011
1,386
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Rockwood, TN
BTW, I tried the speed HUD app on the way home last night. It was off by 2 mph, in the current truck I was driving. I find vehicle speedometer‘s not to be accurate amongst each either also.
The only true way to test that is with a radar divice. I'm not talking about the ones on the side of the roads either. Those are purposely set to show a higher speed with the belief it'll slow traffic down some. Generally a motor vehicle's speedometer is set up for a particular tire and air pressure. Change that and it affects your speedometer accuracy.
 
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wheelbender6

Well-Known Member
Sep 4, 2008
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Nice bike,
Debating on motorizing my cannondale killer v500.. Its pinky weight and made with aerospace aluminum.. Would probably be better than my fuji mx600 series.. But the frame on the cannondale is really thick so id need bigger motor mounts, which i dont have atm. But its a sound idea lol
The Cdale Killer V is a classic, so I wouldn’t motorize it. Find a nice steel mountain bike to motorize fort trail riding, I MHO.