My New Mid School Bmx Frame and other bits the build begins

[Spen69]

If you do decide to try and cut the forks down, make sure you wind your headset top-cap on first followed by the top-nut I sent you without the stopper ring on it way past the area you are cutting as this will help clear the threads after you've cut them. Make sure you file the burrs (sharp edges) off first then when you wind the nut and the top-cap back off one at a time, you will get two chances to straighten out the cut threads

Not assuming you are daft, but make sure you take your time, use a good vice and a sharp hacksaw blade

[AceFto]

Hi guys sorry not replied took the bike to work today
And been having issues with the sprocket I believe as the chain is getting loose and tight automatically and it doesn't spin freely
Had a look on YouTube and it comes up as the crank arm where the sprocket sits it should have a bolt going through it but on this arm the sprocket just pops in and it's unevenly rubbing I took the arm off and as you can see in this picture the sprocket is unevenly worn
Damn only purchased this crankset off eBay and the sprocket from separate sellers,
What do I do now

[poorboyee]

(7.50mins onwards)

you need a 19 or 22mm top hat washer which fits in the chain wheels center hole, this will fill the gap and stops the movement plus centers everything! don't worry you haven't fully wrecked it just don't ride it until you fit one, and everything will run lovely and smooth

[Spen69]

you need a 19 or 22mm top hat washer which fits in the chain wheels center hole

I'll have a look in my box of stuff Abid as i'm sure I have one. Not having much luck mate but hang in there,we'll get you sorted. Can you measure the outside diameter of the crank spindle to be sure it's a 19mm and not a 22mm on though

[AceFto]

(7.50mins onwards)

you need a 19 or 22mm top hat washer which fits in the chain wheels center hole, this will fill the gap and stops the movement plus centers everything! don't worry you haven't fully wrecked it just don't ride it until you fit one, and everything will run lovely and smooth

Thank you for that what a relieve. I've tried tightening the chain like 20 times and loosen it by undoing the nuts on the wheel
Was going mad and then thought something is not right

Much appreciated

The ride I had to work was amazing after all those years

[AceFto]

you need a 19 or 22mm top hat washer which fits in the chain wheels center hole

I'll have a look in my box of stuff Abid as i'm sure I have one. Not having much luck mate but hang in there,we'll get you sorted. Can you measure the outside diameter of the crank spindle to be sure it's a 19mm ad not a 20mm on though

Hi Spen your a life saver
I've just measured it and it's 22mm
Damn was looking forward to riding it weekend lol guess the wait will be worth it in the end 

[Spen69]

Abid I only have 19mm crank stuff unfortunately as i've never owe'd anything 22mm. The one you need is a 22-23.8mm top hat washer. I did a quick search and Jack at Waller BMX has one:

https://wallerbmx.co.uk/top-hat-spacer-bmx.html

Make sure choose the right one and don't forget it will cost £2.99 for the washer and £2.99 to post it. Or he is literally 2 miles from my house so I can go into the shop this morning and buy it and put it in the envelope with the Dyno stem if you want to buy that for £12 posted so £15 for both items - it's up to you mate 

Let me know

Tried Alan's and they are ut of stock.

https://m.alansbmx.com/231693/products/crank-top-hat-washer.aspx?oldid=231693&mredirect=true

[pickle]

Top work Spen, that's why this place is THE best 

[AceFto]

Abid I only have 19mm crank stuff unfortunately as i've never owe'd anything 22mm. The one you need is a 22-23.8mm top hat washer. I did a quick search and Jack at Waller BMX has one:

https://wallerbmx.co.uk/top-hat-spacer-bmx.html

Make sure choose the right one and don't forget it will cost £2.99 for the washer and £2.99 to post it. Or he is literally 2 miles from my house so I can go into the shop this morning and buy it and put it in the envelope with the Dyno stem if you want to buy that for £12 posted so £15 for both items - it's up to you mate 

Let me know

Tried Alan's and they are ut of stock.

https://m.alansbmx.com/231693/products/crank-top-hat-washer.aspx?oldid=231693&mredirect=true

Good morning Spen thanks for that send me payment details mate cheers

[ED209]

its improving all the time that  ... to go over the great advice you have had ...

- bars at worst have to be straight up and never forward ... tilted back a little is best

- reflectors are the first thing that Mr Hammer needs to meet :-)

- bars are good enough but mid ones would be better ... same for the tyres ... they are ok but fatter tan walls better

- stem needs to go as discussed ... its awful 

- brake lever needs moving forward - it should be comfortable to pull from a standing, not sitting position

I've got a top hat washer if needed ( if Spen can't get you one )

I've also got a chunky Fishbone seat clamp you can have  just tell me what diameter yours is and I will check mine fits

( did you get your password sorted btw? )

[AceFto]

Hi Ed thanks password is sorted

- I will defo adjust the bars
- reflectors will be gone
- Stem will be sorted from Spen + top hat if he can't get hold of one then I will be in tocuh
- will adjust the lever too
- seat clamp size is 28.6mm


thank you very much 

[Spen69]

Abid i'll be down to see Jack in about an hour mate to drop a wheel off so i'll let you know. Checked the Dyno stem over and it's all present and correct so i'll go to the post office on my way back from Waller BMX and get them off to you.

[AceFto]

Abid i'll be down to see Jack in about an hour mate to drop a wheel off so i'll let you know. Checked the Dyno stem over and it's all present and correct so i'll go to the post office on my way back from Waller BMX and get them off to you.

Thank you Spen message me your mobile number and paypal details and then I will pay right away

[Spen69]

Top hat washer collected and posted with the stem Abid

Fingers crossed they might land tomorrow with a bit of luck

[AceFto]

thank you very much mate I just paid
what can I say Top man 
really appreciate you going out of your way 

[ED209]

thank you very much mate I just paid
what can I say Top man 
really appreciate you going out of your way 

Good ol Spen ... he never comes up short 

[griff]

thank you very much mate I just paid
what can I say Top man 
really appreciate you going out of your way 

Good ol Spen ... he never comes up short 

You'd think it would get old 

[oldtired]

   no never does

[Midschoolfool]

Looks great man.

I would only worry about the period correctness if you just want to sit and look at it. At the end of the day if you are going to actually ride it do whatever feels best for you.

[AceFto]

Received the top hat and the dyno stem  thank you very much Spen

It's much better now but has a tiny bit of play in the disk chain slightly tightens up I'm going to ride it to work tomorrow hopefully I will be able to live with it managed to change the stem too, took the reflectors off and straightened the bars. Is the stem ok the way I've tightened it

[ED209]

I would only worry about the period correctness if you just want to sit and look at it. At the end of the day if you are going to actually ride it do whatever feels best for you.

There's a bit more to it than that. Parts that are too early or too late just don't sit well together... its not just about sitting and looking at it. No one who is taking the time to build a bike and start and thread on here is just doing it to ride it ... they are doing it to get feedback, learn and feel they have built a decent looking bike ... this bike is well on the way to being just that that through the changes made from the suggestions ... using stuff from around the right time just makes it look right as they were all designed around the same time with the same ethic behind it 

[Spen69]

Abid that looks great mate. Just make sure the top of the stem is parallel with the base and really tight

Back to the chainring wobble, I assume it now moves side to side slightly, not up and down as it was before - if so the chainwheel is possibly fractionally thinner than the recess on the top hat washer and could need a bottom bracket washer to help it sit tight. Let me know and I will post out one to you to finally sort it mate

I forgot to say earlier this bike looks great now. Yes eventually change the tyres but only for final looks. Just get it ridden and enjoyEd now the better weather is here

[deeman]

Stem looks loads better! 

[oldtired]

looks a lot better with that stem ,   

file/grind  the inner of the top hat so it is a little thinner than the chainwheel , this will sort out the side to side movement , you may not have enough room on the spindle to add a spacer washer,  as the spindle length is set on the driveside

  as to forwards backwards movement , i've noticed the crank set has a peg for the chainwheel ,  this looks as though it is a machined bolt , or a threaded peg with a lock nut,    see if it comes out, you could make a spacer (washers) or use the locknut if thats what it is, for the outer of the chainring then  use a bolt to hold the chainring to the arm ,  it's most likely an m8 or m10 thread , m10 is a standard crank arm bolt with a allen key head,     reason for this is you may find the hole in the chainwheel will stretch out over time increasing the movement issue , older one piece cranks caused the same  issue

i know you have just bought the crankset but put on the list for the future a change to a tubular cromo crankset , will have a few advantages     will be lighter, stronger and have a bolt in the arm for the chainwheel ,     



 

[Midschoolfool]

If those pegs are bolt on (threaded) then you shouldn't use your wheel nuts. You want them against the frame as a brace or that axle will bend fast.

And flip the seat guts man. Looks 100 times better