where to buy a 1 5/16th headset

[Joeskustoms]

My Rollfast frame has a 1 and 5/16th inner head tube measurement and where can i find a head set that will fit it... :?:

 

[Korporal]

How big is a BMX cup?

 

[Matt 732]

15 years in the bike trade and i have never heard of an 1 5/16" headset. I could be wrong, maybe some antique American or French (they love to be different!) bikes from before the war. I've seen some bloody stupid headset's (Pashley, Raleigh, Klein and the new idea the mountain bike industry has come up with 1 1/8" top, 1 1/2 " lower) but i have the feeling your not measuring it accurately. 1 1/8" headset diameter is ALMOST that size,and maybe the head tube has been ovalised,face the head tube with a 1/18" facing tool and give one a go because your going to have more luck finding Hen's Teeth.

 

[2manybikes]

I think the OG poster is actually looking for a 1" threaded headset with a cup that has an OD of slightly less than 1.3125" . I have run across a few 40s-50s era bikes that had slightly larger head tubes and required different cups.

 

[Joeskustoms]

I think the OG poster is actually looking for a 1" threaded headset with a cup that has an OD of slightly less than 1.3125" . I have run across a few 40s-50s era bikes that had slightly larger head tubes and required different cups.

yeah that is what i am looking for...

 

[Joeskustoms]

here is a pic that i took real quick..

 

[deorman]

Shim out with steel tape. :|

 

[Matt 732]

I see.... okay, the silly thing is I've posted pictures of my 30's Monark head tube with the same odd dimensions! I ended up brazing in some cut down head tube reducers and a new crown race to the forks (available from Ceeways Frame Building Supplies - UK) to make them standard 1" dimensions. Of course in the shop we just shim out loose headsets with strips cut out off beer can's or punch the cups with a centre punch to get them to fit nicely.

 

[2manybikes]

Of course in the shop we just shim out loose headsets with strips cut out off beer can's or punch the cups with a centre punch to get them to fit nicely.

Now thats what I'm talkin bout...Used up beer cans and a hammer :mrgreen:

 

[Bendix]

the wald headset is ever-so-slightly larger than a standard bmx. not the greatest quality, but then neither are a lot of old head tubes....

(a perfect fit in my prewar snyder-built rollfast)

 

[J_Westy]

How big is a BMX cup?

BMX is 32.7mm or 1-4.6/16ths

http://www.sheldonbrown.com/cribsheet-headsets.html