Best way to add rake?

[nick_ish]

Hi guys i was wondeein what would you sugest for adding a little bit of rake to a lugged frame?
I dont need much just want to lower and lenghthen the front end :wink:

 

[scrumblero]

lugged frames are kinda hard to rake, the lugs are cast and don't bend well, I wonder if you could un-braze it and flip it and get it to line up ?? :roll:

too bad I don't have any lugged frames to try it on...

 

[nick_ish]

i suppose that would work? :?
but what i might try is cutting the tubes just before the lug. like cut a slot out of top tube then cut a v shape out of the bottom bend and re-weld? might also be an opportunity for me to learn to weld / stretch the frame slightly. :mrgreen:

 

[Rockit!]

Well that would change the geometry of the top tube. Have you thought about altering the fork instead?

 

[nick_ish]

how do you mean :?:

 

[Rockit!]

Well if you do it like that the top tube won't be straight anymore, it will have a "crook" in it.

 

[user 135]

Well that would change the geometry of the top tube. Have you thought about altering the fork instead?

Follow KOTA's instruction in this thread. Fork are much cheaper and easier to replace than frames.

http://ratrodbikes.com/forum/viewtopic.php?f=3&t=9254

 

[Graylock]

Well if you do it like that the top tube won't be straight anymore, it will have a "crook" in it.

This happens everytime with the lug system. The other thing is that your dealing with 2 tubes, one you pie shape a notch, bend and weld and the second tube doesn't line up. I have redirected tubes on some of my swing bikes to reset the head angles. To me I was experimenting with head angles and was not concerned what the neighbors thought on how it looked. I have seen someone on the interweb from Eastern Canada or maybe it was Europe messing with this lug dilemma but can't remember who it was. I know they made it look good, it can be done.
If I was atempting this I do the pie shape cut on the top of the bottom tube and leave a little bit of tube connected so when I bend and weld everything stays lined up some what. Before you even do this you would have to plan on bending the bottom tube up a little with a conduit bender. :shock: and before that you have to plan on where your going to cut the top tube so that it lines up :roll: . I just mocked this up on paper and I suggest that you could do this on cardboard (CAD) by tracing the section of the bike where you are doing this. I think you can come up with something that looked really good. 8)

Graylock

 

[Graylock]

Well that would change the geometry of the top tube. Have you thought about altering the fork instead?

Follow KOTA's instruction in this thread. fork are much cheaper and easier to replace than frames.

viewtopic.php?f=3&t=9254

Yeah that too!

Gl

 

[nick_ish]

Ok this all sounds very complicated so i may go have a look at kota's thread got 2 sets of forks kickin round