Author Topic: Hoop installed - enough surface to support seat?  (Read 1532 times)

0 Members and 1 Guest are viewing this topic.

Offline Sox Fan

  • Full Member
  • *
  • Posts: 28
Hoop installed - enough surface to support seat?
« on: November 24, 2016, 10:05:07 AM »
Starting to make some progress with my build. Cut the rear frame and welded in a hoop and a couple of braces for a flat, brat style seat from Dime City. I think this is enough surface to mount the seat?

Offline seanbarney41

  • not really that much younger than an
  • Really Old Timer ...
  • *******
  • Posts: 10,836
Re: Hoop installed - enough surface to support seat?
« Reply #1 on: November 24, 2016, 10:14:00 AM »
and the back wheel goes where when the suspension compresses?
If it works good, it looks good...

Offline firebane

  • Hot Shot
  • ***
  • Posts: 360
Re: Hoop installed - enough surface to support seat?
« Reply #2 on: November 24, 2016, 11:10:41 AM »
and the back wheel goes where when the suspension compresses?

Quit being so silly shocks don't compress.

Offline seanbarney41

  • not really that much younger than an
  • Really Old Timer ...
  • *******
  • Posts: 10,836
Re: Hoop installed - enough surface to support seat?
« Reply #3 on: November 24, 2016, 11:33:23 AM »
and the back wheel goes where when the suspension compresses?

Quit being so silly shocks don't compress.
thats what I thought until one day when I stopped looking at trendy bikes online and actually rode one
If it works good, it looks good...

Offline RAFster122s

  • I feel like a really really
  • Really Old Timer ...
  • *******
  • Posts: 12,368
  • SOHC4 member # 2605
Re: Hoop installed - enough surface to support seat?
« Reply #4 on: November 24, 2016, 12:00:11 PM »
Just weld up a hard tail  and let your spine handle the compression.  It is all for the looks anyway...cafe bikes and brats to be ridable jewelry for many. They won't ride them in the rain or when it drops below 55-60F.

Shocks, who needs shocks?
David- back in the desert SW!

Offline Sox Fan

  • Full Member
  • *
  • Posts: 28
Re: Hoop installed - enough surface to support seat?
« Reply #5 on: November 24, 2016, 12:10:54 PM »
and the back wheel goes where when the suspension compresses?

Sorry - what does that have to do with mounting a seat?

Offline RAFster122s

  • I feel like a really really
  • Really Old Timer ...
  • *******
  • Posts: 12,368
  • SOHC4 member # 2605
Re: Hoop installed - enough surface to support seat?
« Reply #6 on: November 24, 2016, 01:13:02 PM »
He was trying to point out that flattening the rear with a hoop that is flat will not provide the tire clearance when the rear suspension fully compresses. This results in very bad things happening when that occurs.
David- back in the desert SW!

Offline seanbarney41

  • not really that much younger than an
  • Really Old Timer ...
  • *******
  • Posts: 10,836
Re: Hoop installed - enough surface to support seat?
« Reply #7 on: November 24, 2016, 02:44:27 PM »
and the back wheel goes where when the suspension compresses?

Sorry - what does that have to do with mounting a seat?
dude, your seat will be mounted strong...don't worry about the back wheel hitting
If it works good, it looks good...

Offline calj737

  • Really Old Timer ...
  • *******
  • Posts: 21,041
  • I refuse...
Re: Hoop installed - enough surface to support seat?
« Reply #8 on: November 25, 2016, 03:10:30 AM »
Its more than enough surface area and bracing to support your seat. In fact, with a closed loop, the cross bracing is superfluous. To Sean's point, you may actually want to remove the flat stock to allow the tire to move upwards during suspension compression so as not to conflict with the brace/tread.

You are not the first to perform this modification and not realize the potential for conflict. Nor will you be the last. Longer shocks tend to be the requirement afterwards which alters the steering geometry and thus, the negative feedback from some with prior experience. Don't take slightly snarky comments personally, its just that certain "mistakes" are seen repeatedly and some folks get tired of explaining the same thing over and again.  ;)
'74 550 Build http://forums.sohc4.net/index.php?topic=126401.0
'73 500 Build http://forums.sohc4.net/index.php?topic=132935.0

"Of all tyrannies, a tyranny sincerely exercised for the good of it's victim may be the most oppressive. It may be better to live under robber barons than under omnipotent moral busybodies. The robber baron's cruelty may sometimes sleep, his cupidity may at some point be satiated, but those who torment us for our own good will torment us without end for they do so with the approval of their own conscience." - C.S. Lewis

Offline JoeCooley

  • Long time lurker, but now I'm a
  • Hot Shot
  • ***
  • Posts: 298
Re: Hoop installed - enough surface to support seat?
« Reply #9 on: November 25, 2016, 03:38:49 PM »
Nice job welding in the hoop.
Joe in San Diego - Quick Cyles
78 CB750K 836cc Highway Racer - http://forums.sohc4.net/index.php/topic,162264.0.html

Rickman CR750 Restoration (SOLD)

Offline Sox Fan

  • Full Member
  • *
  • Posts: 28
Re: Hoop installed - enough surface to support seat?
« Reply #10 on: November 26, 2016, 08:27:44 AM »
Thank you. Rookie welder.

Offline Sox Fan

  • Full Member
  • *
  • Posts: 28
Re: Hoop installed - enough surface to support seat?
« Reply #11 on: November 26, 2016, 08:32:32 AM »
Its more than enough surface area and bracing to support your seat. In fact, with a closed loop, the cross bracing is superfluous. To Sean's point, you may actually want to remove the flat stock to allow the tire to move upwards during suspension compression so as not to conflict with the brace/tread. 

Thanks for your thoughts. Very helpful.  That brace all the way back I don't think will be any lower than the underneath of the seat so I suppose if it is going to rub, the rear tire will either hit that brace or the bottom of the seat.  Will have to see what shock setting is best once I have the rear wheel installed.

Offline Steve_K

  • Expert
  • ****
  • Posts: 923
Re: Hoop installed - enough surface to support seat?
« Reply #12 on: November 26, 2016, 10:16:57 AM »
It is easy to check clearance.  Remove one shock, take spring off(I can do with my hands) and put back on.  Remove the other shock and raise the wheel and check with shock compressed.  Easy to with a centerstand, but do able without.

Steve
Steve_K

76 CB 550, 73CB750, 86 GSX-R750, 16 Slingshot
Old rides:305 Honda, CL350, 74 CB550
 05 SV1000S, 88 CBR600,92 VFR, 88 Hawk GT, 96 Ducati 900SS, 98 Kaw ZX6R, SV650