JACKS FOR EBIKE?

[Base]

OK, maybe I'll give it a try.

My house was built in 1942, so the timbers are old.

we've got those https://hollandbikeshop.com/en-gb/b...uperlift-bicycle-rig-up-to-57kg-black-734067/

same system. Personally I would use a different cord, the ones which come with these systems are rather poor. and yes they work. I do not own these but a relative does.

 

[Gionnirocket]

Sister the joists with equivalent dimensional lumber, or better yet, 3/4" plywood. Lag the sandwich horizontally. Lag the hoist to the underside of the joist inside the sandwich.

I'm not sure I would trust that..
I'd sister the beam with an equivalent steel one and make sure it went the full legnth of the joists resting on the joist supports. Then I'd add a steel column on each side of each stationary pulley just to be sure.
Your lifting a bike... Not a car.
I'm in +100 year old 2x10 floor joist so if you're in 2x4 roof/ceiling rafters maybe then I would add some lumber. 2x6 and above you're fine

 

[Gionnirocket]

we've got those https://hollandbikeshop.com/en-gb/b...uperlift-bicycle-rig-up-to-57kg-black-734067/

same system. Personally I would use a different cord, the ones which come with these systems are rather poor. and yes they work. I do not own these but a relative does.

I agree the cord could be better... But two years in and they still have all strands in tact.
I plan on getting some parachute cord if it ever does give me a reason for concern.

 

[stompandgo]

I'm not sure I would trust that..
I'd sister the beam with an equivalent steel one and make sure it went the full legnth of the joists resting on the joist supports. Then I'd add a steel column on each side of each stationary pulley just to be sure.
Your lifting a bike... Not a car.
I'm in +100 year old 2x10 floor joist so if you're in 2x4 roof/ceiling rafters maybe then I would add some lumber. 2x6 and above you're fine

1-1/2" of plywood is much, much stronger than equivalent softwood 2x dimensional lumber.

 

[Gionnirocket]

1-1/2" of plywood is much, much stronger than equivalent softwood 2x dimensional lumber.

I concur.
My point was that we are lifting at max a 100lb bike with the load spread between at a minimum 2 points of the structure. If it's built to code there's no need to over think it.
@PCeBiker if you end up being perpendicular to your joist... Just use a 2x4 to span the 3 or 4 joist and you can put it exactly where you want.