Tiptoeing around

[nzspokes]

He must think it's OK if he's had it only his last few bikes & current one



Just another average day at the retirement home huh?

We have one, good for the pillion. Sucks for the rider. If you are a rider that moves around on the bike a bit you will hate it.

[T.W.R]

We have one, good for the pillion. Sucks for the rider. If you are a rider that moves around on the bike a bit you will hate it.

lol I'm not promoting them and definitely not something I'd use myself
Did too many kms on a bike with the proverbial church pew for a seat so anything with a bit of padding these days is a luxury & don't have any issues getting the shanks on the ground...actually more of the reverse folding the buggers up onto the pegs

[Ocean1]

He must think it's OK if he's had it only his last few bikes & current one



Just another average day at the retirement home huh?

Oh he does. I wouldn't be surprised if the deviant bastard paid someone else to shit in his nappies.

[varminter]

Do you ride in them carpet slippers?

[red675]

I think you missed my point. When can you make me one and how much?

Can you make it work on a bike with a mechanical speedo?

The bike I made it for is a Tiger 800 - I used the signal from the road speed sensor mounted on the top of the transmission and had a backup plan to use the ABS sensor on the rear wheel (the bike has one or other of these but not both, so I retrofitted the road speed sensor so I could have the choice. I'm guessing yours is something older so a magnetic front wheel speedo sensor could be retrofitted but it's pointless guessing : what kind of bike are you talking about ?

To be honest with a bit of practice I could probably do without the auto actuation, but I'm thinking that making a system without that protection would be completing only half the job. Be nice to talk to you about it as there haven't been any constructive suggestions thus far.

[nzspokes]

The bike I made it for is a Tiger 800 - I used the signal from the road speed sensor mounted on the top of the transmission and had a backup plan to use the ABS sensor on the rear wheel (the bike has one or other of these but not both, so I retrofitted the road speed sensor so I could have the choice. I'm guessing yours is something older so a magnetic front wheel speedo sensor could be retrofitted but it's pointless guessing : what kind of bike are you talking about ?

To be honest with a bit of practice I could probably do without the auto actuation, but I'm thinking that making a system without that protection would be completing only half the job. Be nice to talk to you about it as there haven't been any constructive suggestions thus far.

Here is a thought. If we were to fit a full quickshifter could it say work or inflate when the bike went to second?

I have a specific application in mind here.

[Big Dog]

I would have thought you would want to activate it off of the clutch (with a pause to ignore shifts) or off a neutral?

It seems like a thousand dollar solution to a $50 problem so I was was keen to not seem disrespectful.

If you are dead set on this as an answer or are looking to develop these for sale it might pay to look at what the wheel chair guys in the states do with activating training wheels under various conditions and apply that to your seat?
There are as many setups a there are people with problems. From the thumb activated ( rules out any logic issues as long as the rider is switched on ) to the fancy pants run by a rasberry pi compares throttle use, speed, clutch and brake to actuate according to rules. E.g applying rear brake only, only activate if speed drops below 5 km. handy for trail braking to not have a change in seat tension. If clutch and brakes are both pulled for 2 or more gear changes compress to allow either foot to go down quickly etc.

I guess you need to decide what level of user input do I want vs what am I happy to hand over to my rig? Now how do I make that happen inside my budget?
I am not a fan of these kind of mods but like the fact you are giving it a go.


Stupid phone / Tapatalk, apologies in advance.

[T.W.R]

Just adapt the principles of Citroen's Hydropneumatic suspension system

Link to the basic overview

[red675]

I would have thought you would want to activate it off of the clutch (with a pause to ignore shifts) or off a neutral?

It seems like a thousand dollar solution to a $50 problem so I was was keen to not seem disrespectful.

If you are dead set on this as an answer or are looking to develop these for sale it might pay to look at what the wheel chair guys in the states do with activating training wheels under various conditions and apply that to your seat?
There are as many setups a there are people with problems. From the thumb activated ( rules out any logic issues as long as the rider is switched on ) to the fancy pants run by a rasberry pi compares throttle use, speed, clutch and brake to actuate according to rules. E.g applying rear brake only, only activate if speed drops below 5 km. handy for trail braking to not have a change in seat tension. If clutch and brakes are both pulled for 2 or more gear changes compress to allow either foot to go down quickly etc.

I guess you need to decide what level of user input do I want vs what am I happy to hand over to my rig? Now how do I make that happen inside my budget?
I am not a fan of these kind of mods but like the fact you are giving it a go.


Stupid phone / Tapatalk, apologies in advance.

thanks, that's just the kind of response I was looking for - some things to ponder on. At this point I still figure forward speed is the determinator for actuation as I can't see anyone wanting to put load through their boots unless the bike is at rest or close to it. Just one point on the money side of things, the $1000 spent was never the intended cost of a single item, but then $50 wouldn't come close either.

[red675]

Just adapt the principles of Citroen's Hydropneumatic suspension system

Link to the basic overview

what is it about Citroen's Hydropneumatic suspension system ??? It wasn't that good or it would have been copied by now by everyone and all over the place, but you keep coming across people who swear it beats sliced bread

[red675]

Here is a thought. If we were to fit a full quickshifter could it say work or inflate when the bike went to second?

I have a specific application in mind here.

so a DB5 inspired ejector seat or a vertical launch mechanism for a Jetpack which would save the cost of being dropped from a plane ???

[Maha]

what is it about Citroen's Hydropneumatic suspension system ??? It wasn't that good or it would have been copied by now by everyone and all over the place, but you keep coming across people who swear it beats sliced bread

Gimmick, they pop up (pun intended) from time to time in the mechanical world. If there is no real advantage/merit in an idea, it basically stays a gimmick.

[nzspokes]

so a DB5 inspired ejector seat or a vertical launch mechanism for a Jetpack which would save the cost of being dropped from a plane ???

No. But good idea.

My partner is a bit disabled after a crash. We are building a bike to suit her needs. One problem we will have is getting the seat low enough for her to hold the bike. But if we do that we run out of lean angle. Your seat idea could help with this.

[Big Dog]

thanks, that's just the kind of response I was looking for - some things to ponder on. At this point I still figure forward speed is the determinator for actuation as I can't see anyone wanting to put load through their boots unless the bike is at rest or close to it. Just one point on the money side of things, the $1000 spent was never the intended cost of a single item, but then $50 wouldn't come close either.

The concern linking it purely to speed is that things that are unsettling can really put you off your game when emergency braking.
What I mean is: a seat suddenly deflating could change several characteristics while you are already braking hard. 2 inches seat height might not amount to much or it could have a dramatic effect on your perception of the event.

Before I embarked on any sort of lengthy test ride I would want to compare my braking distances with the seat enabled and disabled. An extra foot or two might be still be acceptable knowing the characteristics such as carrying a pillion means an extra 5-10% braking distance but I might chose to take one anyway and ride accordingly.
Is that better or worse on gravel?


Stupid phone / Tapatalk, apologies in advance.

[red675]

No. But good idea.

My partner is a bit disabled after a crash. We are building a bike to suit her needs. One problem we will have is getting the seat low enough for her to hold the bike. But if we do that we run out of lean angle. Your seat idea could help with this.

I'm truly sorry to hear that.
I lowered the seat base relative to the top of the frame as far as it would go (stole another 15mm that way) and then to be fair the maximum lowering I could achieve was limited to the thickness of the original seat which in my case was 60mm - so what's achievable is strongly linked to the geometry of the bike you start with. If you prefer you can PM me with the details and maybe send me some pictures but at some point it'll need measuring it or something like it to see what scope there is for improvement.