Lowering by modifying seat sub frame - Triumph675.Net Forums
Modifications Please select the appropriate Sub-forum for your post or thread

Reply
 
Thread Tools Display Modes
post #1 of 11 Old 10-20-16, 07:35 Thread Starter
Guest675
Junior Member
 
Join Date: Oct 2016
Posts: 1
Thanks: 0
Thanked 0 Times in 0 Posts
Lowering by modifying seat sub frame

I am new here, I don't have a 675 (yet) and I want to know if the 675 Daytona or the street triple can be drastically lowered by modifying the seat sub frame? It looks possible, but I have never heard of it being done.
Suspension lowering kits just won't give me enougth lowering - I am v. short and more used to riding cruisers.
Guest675 is offline  
post #2 of 11 Old 10-20-16, 08:19
Plasmablaster
Senior Member
 
Plasmablaster's Avatar
 
Join Date: May 2016
Location: Thessaloniki
Posts: 868
Thanks: 120
Thanked 105 Times in 90 Posts
Garage
If there is a shop nearby with aluminum welding ability I believe you could do it. It would involve a lot of trial and error though as the components that are fitted on the sub-frame are designed to fit with that subframe and if you cut & lower it then it'll probably be a tough call having them fit again. It would also ruin the re-sale value of the bike.

Personally I wouldn't bother. If the lowering kit allows you to place your toes and front part of the foot on the ground you are good to go. Lowering the front could also help you a little and if you have lowered the back considerably it should be done anyway in order to retain steering geometry.

As an ultimate solution I would try to modify the seat instead of the sub-frame. You could win half an inch or so if you are willing to remove a bit of foam and having a bit of a harder seat.
Plasmablaster is offline  
post #3 of 11 Old 10-20-16, 12:15
MGFChapin
Senior Member
 
MGFChapin's Avatar
 
Join Date: Aug 2006
Location: Seattle
Posts: 7,779
Thanks: 83
Thanked 340 Times in 310 Posts
Garage
Quote:
Originally Posted by Plasmablaster View Post
As an ultimate solution I would try to modify the seat instead of the sub-frame.
This. Shave the seat and get lowering links and you should be able to get at least one foot firmly down.
MGFChapin is offline  
post #4 of 11 Old 10-20-16, 15:10
UAV
Junior Member
 
UAV's Avatar
 
Join Date: Jul 2014
Location: Bellflower, CA
Posts: 101
Thanks: 4
Thanked 12 Times in 11 Posts
Not to be rude here.. but rather than drastically modifying the bike, why not modify your technique? I have pretty short legs, too.. so early on I learned to shift my butt across the saddle when I need to put a foot on the ground. I haven't been able to "flatfoot" any of my bikes, since my first.. which was a 400cc scooter. The Ninja 300 was the other exception, at least before I upgraded the stock suspension.. which sucked. That's the thing about lowering a bike.. you lose suspension travel and compromise handling. Why ride a sportbike at all then?

Anyway, I would suggest making your transition on a cheaper sportbike or dual-sport.. preferably one that's been pre-dropped by the previous owner so you don't have to worry about it. And practice, practice, practice. Then once your confident enough to handle the bike---especially at low speeds---without using your feet as outriggers, then go out and get your dream 675.
UAV is offline  
post #5 of 11 Old 10-21-16, 10:16
Glocken
Senior Member
 
Glocken's Avatar
 
Join Date: Sep 2011
Location: Brooklyn
Posts: 2,414
Thanks: 29
Thanked 86 Times in 73 Posts
Quote:
Originally Posted by UAV View Post
Not to be rude here.. but rather than drastically modifying the bike, why not modify your technique? I have pretty short legs, too.. so early on I learned to shift my butt across the saddle when I need to put a foot on the ground. I haven't been able to "flatfoot" any of my bikes, .
seriously, I never understood this. The only time I've ever wished I could flat foot both my feet was during a crazy windstorm where I was getting tossed and fighting the bike at a stoplight.

Elka 3 way shock|Penske fork valves|Leo full titanium & CF|Hyperpro steering damper|GB frame slider & engine casings|Cyclecat clipons|Pazzos|ZG|Proton|CF tank sliders|Dave Moss Techspecs|Evo Tech Sharkfin|Sato Shift Spindle holder
Glocken is offline  
post #6 of 11 Old 12-09-17, 09:44
jairaj
Junior Member
 
Join Date: Dec 2017
Posts: 2
Thanks: 0
Thanked 0 Times in 0 Posts
Quote:
Originally Posted by Plasmablaster View Post
If there is a shop nearby with aluminum welding ability I believe you could do it. It would involve a lot of trial and error though as the components that are fitted on the sub-frame are designed to fit with that subframe and if you cut & lower it then it'll probably be a tough call having them fit again. It would also ruin the re-sale value of the bike.

Personally I wouldn't bother. If the lowering kit allows you to place your toes and front part of the foot on the ground you are good to go. Lowering the front could also help you a little and if you have lowered the back considerably it should be done anyway in order to retain steering geometry.

As an ultimate solution I would try to modify the seat instead of the sub-frame. You could win half an inch or so if you are willing to remove a bit of foam and having a bit of a harder seat.
well i am trying to make a bolt on bracket , which could be fixed to the main frame, and the sub frame bolted on to it. would lower the bike to more than three inches without affecting steering geometry. Currently this is in the cad design stage , but I am certain this could be and will be done without cutting , welding or scratching anything on the stock bike. you just need two additional chromed bolts and a bit of re doing the seat to blend in with the gaps.
jairaj is offline  
post #7 of 11 Old 12-10-17, 21:19
Plasmablaster
Senior Member
 
Plasmablaster's Avatar
 
Join Date: May 2016
Location: Thessaloniki
Posts: 868
Thanks: 120
Thanked 105 Times in 90 Posts
Garage
Quote:
Originally Posted by jairaj View Post
well i am trying to make a bolt on bracket , which could be fixed to the main frame, and the sub frame bolted on to it. would lower the bike to more than three inches without affecting steering geometry. Currently this is in the cad design stage , but I am certain this could be and will be done without cutting , welding or scratching anything on the stock bike. you just need two additional chromed bolts and a bit of re doing the seat to blend in with the gaps.
Three inches!

This is more than drastic. Have you ensured that the motion of the rear wheel (due to suspension operation) is guaranteed to not touch the lowered subframe & attached components after such a drastic lowering?

Also the tank (and perhaps the footpegs too) will be very-very high in relation to your body and it may cause discomfort.

If you need such a lot of lowering I'd suggest a combination of rear link & subframe lowering so that you won't need 3 inches on the subframe alone.
Plasmablaster is offline  
post #8 of 11 Old 12-22-18, 13:48
jairaj
Junior Member
 
Join Date: Dec 2017
Posts: 2
Thanks: 0
Thanked 0 Times in 0 Posts
Quote:
Originally Posted by Guest675 View Post
I am new here, I don't have a 675 (yet) and I want to know if the 675 Daytona or the street triple can be drastically lowered by modifying the seat sub frame? It looks possible, but I have never heard of it being done.
Suspension lowering kits just won't give me enougth lowering - I am v. short and more used to riding cruisers.
It could be done. I am designing an adapter to offset the subframe by two inches. so the bolts go to the subframe and the adapter and the extra set of holes will align with the main frame. Hopefully it should work without too much of nuclear research.
jairaj is offline  
post #9 of 11 Old 03-06-19, 17:27
Phantom49
Junior Member
 
Phantom49's Avatar
 
Join Date: Sep 2018
Location: Columbus, OH
Posts: 12
Thanks: 0
Thanked 0 Times in 0 Posts
Triumph made a lowered gel seat. I have one on mine and it's still comfortable enough without being a board.

I have a 30" inseam and am able to stand on the balls of my feet.

Before dropping the subframe 3", I would put the bike up on a stand, and with some help, raise the tank up to see where that is going to hit your torso. Every bump in the road may become a punch to the bottom of your rib cage.

Doing this mod will completely change the way the bike handles because it changes where your weight is distributed. There's a reason the factories didn't go crazy changing riding positions when they were doing updates on the supersport bikes every 2 years. They would move the seat up or down by 3mm, not 3 inches.

Good luck
Phantom49 is offline  
post #10 of 11 Old 03-07-19, 09:52
Glocken
Senior Member
 
Glocken's Avatar
 
Join Date: Sep 2011
Location: Brooklyn
Posts: 2,414
Thanks: 29
Thanked 86 Times in 73 Posts
I have a 28" inseam and ride it just the way it is.


Quote:
Originally Posted by Phantom49 View Post
Triumph made a lowered gel seat. I have one on mine and it's still comfortable enough without being a board.

I have a 30" inseam and am able to stand on the balls of my feet.

Before dropping the subframe 3", I would put the bike up on a stand, and with some help, raise the tank up to see where that is going to hit your torso. Every bump in the road may become a punch to the bottom of your rib cage.

Doing this mod will completely change the way the bike handles because it changes where your weight is distributed. There's a reason the factories didn't go crazy changing riding positions when they were doing updates on the supersport bikes every 2 years. They would move the seat up or down by 3mm, not 3 inches.

Good luck

Elka 3 way shock|Penske fork valves|Leo full titanium & CF|Hyperpro steering damper|GB frame slider & engine casings|Cyclecat clipons|Pazzos|ZG|Proton|CF tank sliders|Dave Moss Techspecs|Evo Tech Sharkfin|Sato Shift Spindle holder
Glocken is offline  
Sponsored Links
Advertisement
 
Reply

Bookmarks

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the Triumph675.Net Forums forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:
OR

Log-in










Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Hybrid Mode Hybrid Mode


Forum Jump

Posting Rules  
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

 
For the best viewing experience please update your browser to Google Chrome