reinforcing stock frame

1478 Views 15 Replies 6 Participants Last post by moto234, Jan 18, 2009

moto234

Discussion Starter · Jan 18, 2009

i know thers threads about this but i dont wanna dig them up.

so heres what im thinkin of doing, let me know if you think its good or a stupid idea lol it sounds good in my head

so i want the get a piece of 1/4" thick steel plating and cut a strip like 8"x2 1/2"(or whatever the diameter of the head tube is) i then want to cut a slice into the top and bottom of the frame head tube and insert the steel strip then weld it in place

heres a pic of what im thinkin, its not a stock frame but the location is good

my thinking is this. if you were to take the metal and hold it horizonataly you could bend it down fairly easily but if you took the same peice of metal and held it up verticaly it would be almost impossible to bend down. so when you put the metal in the frame vertically it should make the frame much harder to bend and rake out. unless the welds bust or something lol

does this make sense?

i posted this in another thread too so if you read it twice thats why

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HRC

· #2 · Jan 18, 2009

Your gonna end up adding a ton(not literally) of weight to an already heavy frame.

Why are you going to put so much work into the frame? Just ride it until it bends/breaks... and then get an aftermarket frame. Done.

moto234

Discussion Starter · #3 · Jan 18, 2009

because i dont want an aftermarket one lol unless i can find one of those fast50s stock deminsion frames.

i want to keep the bike close to stock size and the only way to do that is with a stock sized frame. and aftermarket frame puts the forks an inch forward and the seat and inch higher and thats not what i want. i want the bars and pegs close. im not a midget or anything but i like the challenge of riding the stock sized bike

to me once you get past an 88 with +1 legs, a shock, pipe, tall seat and bar kit you have lost the idea of a backyard 50 and thats what im trying to build

its so much different riding a full mod then a stock/mod and i prefer the stock/mod feeling. ive had both and the stockers are just my thing

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HRC

· #4 · Jan 18, 2009

But are heavy and slow stockers your thing? Adding all that extra steel is gonna do more bad than good.

Motors don't have anything to do with the size of the bike. It's "once you go bigger than the 10" rear tire" THEN it's getting away from "mini's". Tire size.

moto234

Discussion Starter · #5 · Jan 18, 2009

HRC said:
But are heavy and slow stockers your thing? Adding all that extra steel is gonna do more bad than good.

Motors don't have anything to do with the size of the bike. It's "once you go bigger than the 10" rear tire" THEN it's getting away from "mini's". Tire size.

so do you think a perimeter "50" with zokes, disc brakes, a DOHC and all the fancys is a mini? if you've ever ridden one you know how close in size it is to a midsize. about the only difference in the size is the wheels. to me thats not a mini anymore

ok ill agree that the motor has nothing to do with the title of mini. how bout 88s are the funnest motors for small bikes, at least thats my feeling. anything less is too slow and anything more is a little overkill, still fun but not neccesary

and my bike wont be but maybe 8 pounds heavier than yours in the end and yours is powerd by an 88 so does that make your bike slow? the weight is hardly noticable to me anyway, the only time i feel the weight is when i eat shiit and have to pic the bike up lol

moto234

Discussion Starter · #6 · Jan 18, 2009

i could argue about this all day with you lol if you wanna discuss it pm me this thread is about soemthing else and i dont want it all cluttered up with this stuff.

i cant already tell we arent going to agree on this subject so stop posting in this thread unless you have somehting constructive to say, ill be waiting for a pm if you wanna continue the "what makes a mini a mini" convo

HRC

· #7 · Jan 18, 2009

moto234 said:
so do you think a perimeter "50" with zokes, disc brakes, a DOHC and all the fancys is a mini? if you've ever ridden one you know how close in size it is to a midsize. about the only difference in the size is the wheels. to me thats not a mini anymore

ok ill agree that the motor has nothing to do with the title of mini. how bout 88s are the funnest motors for small bikes, at least thats my feeling. anything less is too slow and anything more is a little overkill, still fun but not neccesary

and my bike wont be but maybe 8 pounds heavier than yours in the end and yours is powerd by an 88 so does that make your bike slow? the weight is hardly noticable to me anyway, the only time i feel the weight is when i eat shiit and have to pic the bike up lol

The perimeter is considered a mid size bike... not a mini. If I were in your shoes... I would just have an extra stock frame laying around ready to replace when yours breaks. Your idea is lame on strenghtening the frame. Get some better ideas from thos who have done it... without adding all the extra weight.

I guess you don't grasp the power to weight ratio thing. I could care less if you want a heavy and slow bike..... when compared to a bone stock bike. You can wait for a pm all day if you want.... I don't feel like discussing anything with someone who gets butthurt when he doesn't hear what he wants..... and I already know what makes a mini a mini... do you?

moto234

Discussion Starter · #8 · Jan 18, 2009

HRC said:
The perimeter is considered a mid size bike... not a mini. If I were in your shoes... I would just have an extra stock frame laying around ready to replace when yours breaks.

if the perimeter is considered a midsized then all bike with zokes or similar forks and anything larger than a +3 is as well a midsize, because after all it would be the same sized bike

and id rather just make it so it wont break by adding a little extra metal. do you have any suggestions as to what i could do to make it stronger?

Pitviking

· #9 · Jan 18, 2009

Is it for the back yard or racing?

HRC

· #10 · Jan 18, 2009

moto234 said:
if the perimeter is considered a midsized then all bike with zokes or similar forks and anything larger than a +3 is as well a midsize, because after all it would be the same sized bike

and id rather just make it so it wont break by adding a little extra metal. do you have any suggestions as to what i could do to make it stronger?

Yes, do it right. Adding all that extra steel isn't required and your just adding extra weight. Check with the members who have done it and know how to do it right.... without adding the excess weight. 8.5" x 2" steel???

timo38

· #11 · Jan 18, 2009

This is phase 1 of my frame strengthening a piece of thick 25 mm angle cut to suit the the angles and radiuses of the frame and stitch welded in place,

phase 2 consists of chopping off the subframe and machining up some size for size rods to be put inside the subframe tubing,

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USERNAME

· #12 · Jan 18, 2009

HRC likes to give everyone else a hard time on here so do not even listen to him.

Also sounds like moto234 is building a backyard play bike so who cares about adding weight when he may weigh only 140 lbs like me. He would still be faster then a guy that weighs alot heavier on the same style bike anyway as long as the motors are around the same. Most aftermarket frames weigh more anyways unless you get a billet one like fast 50s makes and for $1300 its only a 1/2 lb lighter. LOL Yeah its sweet looking but hell you can lose a half pound off your bike no problem without touching the frame or even lose that weight off your body easy. You can always lose weight elsewhere on the bike besides the frame to make up for it. Also some of the metal you add on the frame can be lighten with holes or other types of shapes without decreasing strength too much or none at all.

My frame is going to be started in the spring summer time. Going to be alot done to mine and will take my time to figure out whats the best way of doing it. I love fab work and its a good project to fool around on. Mine is going to be a stock mod aswell and I can always build a full mod 50 later on since they do look sweet though but got enough mod midsize bikes for now. LOL

I will be sure to post pics of mine through the process though but will keep my ideas to myself.

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96Justin

· #13 · Jan 18, 2009

your idea isnt too bad, except its just going to pin-point the stress point to the edge of where that flat bar would come down (the point closest to say the rear wheel)

So far the best design was the bar bracing it from the top frame to as low as you can get on the lower part of the frame (there was a pic in that other thread)

USERNAME

· #14 · Jan 18, 2009

What should be a good idea is take a air grinder cut off wheel and slice a line how far you want on the top and bottom of the frame and make the peice as thick as how wide the cut off wheel hold made in the frame. Then slide the peice in vertical and weld it up in the top and bottom. Would be alot thinner and still be pretty strong. You can even cut swiss cheese holes or other design in the peice you weld in there to make it lighter also with out doing anything. Also if you wanted to run a flat peice on the top and bottom of the frame after you weld that center vertical peice to tie in the subframe tube.

For the subframe small gussets and would do just find and may test fit the motor in the frame and run one or two tubes if there is room between both motor mounts so they do not flex.

I got lots of ideas running through my head and I have not even started. Cannot wait to play around with it in the spring or summer. Will have a nice brand new mig welder with gas to use. May even buy a plasma cutter one day.

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moto234

Discussion Starter · #15 · Jan 18, 2009

USERNAME said:
What should be a good idea is take a air grinder cut off wheel and slice a line how far you want on the top and bottom of the frame and make the peice as thick as how wide the cut off wheel hold made in the frame. Then slide the peice in vertical and weld it up in the top and bottom. Would be alot thinner and still be pretty strong. You can even cut swiss cheese holes or other design in the peice you weld in there to make it lighter also with out doing anything. Also if you wanted to run a flat peice on the top and bottom of the frame after you weld that center vertical peice to tie in the subframe tube.

thats a better way of saying what i want to do lol i couldnt really think of the words. cutting holes in it would be a good idea to save some weight. and yea i only weight 140 soaking wet so weight isnt an issue for me

timo38 said:
This is phase 1 of my frame strengthening a piece of thick 25 mm angle cut to suit the the angles and radiuses of the frame and stitch welded in place,

phase 2 consists of chopping off the subframe and machining up some size for size rods to be put inside the subframe tubing,

thats a good idea too. i may have to take a little of mine and this one and put them together

Pitviking said:
Is it for the back yard or racing?

backyard riding with the pals

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moto234

Discussion Starter · #16 · Jan 18, 2009

timo38 said:
This is phase 1 of my frame strengthening a piece of thick 25 mm angle cut to suit the the angles and radiuses of the frame and stitch welded in place,

phase 2 consists of chopping off the subframe and machining up some size for size rods to be put inside the subframe tubing,

thats a good idea too. i may have to take a little of mine and this one and put them together

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