Hi, welcome to the club.

Unfortunately (for you anyways) this forum is aimed at Suzuki 4x4s, mainly used for off roading.

Whilst there are a few bike owners on here, it’s unlikely you’ll get an accurate response.

Probably be best of searching for a bike oriented forum or a facebook group.

Chance are its standard gearing. Without pulling diffs and transfer boxes out to count the revolutions you won’t know.

There is some handy info here to help work out how far out the gearing going from standard tyres to bigger tyres.

viewtopic.php?f=12&t=2947

As mentioned above. If the gearing is out it will be very sluggish and down on power even on small gradients. Knackered bearings will grumble and you can usually feel some up and down movement if you put a bar under the wheel and wiggle it up and down. Did you fit new sliders or clean and grease the...

If both wheels are spinning freely when its off the ground the rear brakes should be fine. When you have it jacked up, spin the wheels, press and release the brake. Is it easy enough to get the wheel to spin again? Or is one brake sticking on? As for being sluggish / hard to pull away, what sort of ...

Try bigg red. Had parts from them before too.

Bigg red on ebay

https://www.ebay.co.uk/itm/274064441486

If they are seized chuck them in a bucket of duck oil for a bit.

Brand new jimny caliper. A lot cheap than SJ calipers despite being the same caliper

https://www.ebay.co.uk/itm/363054656510

For some reason the first link isn’t working. https://brakeparts.co.uk/shop/Suzuki/anus/88-96/anus%20Sj413%20Samurai%201.3%204X4/Front%20-%20Brake%20Calipers%20and%20Wheel%20Cylinders If that link doesn’t work just search by suzuki, j eep (had to put a space in as the word anus always appears on thi...

Refurb them if the castings are ok. https://brakeparts.co.uk/shop/Suzuki/anus/88-96/anus%20Sj413%20Samurai%201.3%204X4/Front%20-%20Brake%20Calipers%20and%20Wheel%20Cylinders New are readily available but a bit more expensive. https://brakeparts.co.uk/shop/Suzuki/Jimny/98-05/Jimny%201.3%204X4/Front%2...

Looks like some awesome fabrication work going on.

Euro car parts

Looks like a standard Aisin japanese built SJ caliper and pad.

Suzuki used two different calipers. One for the Japanese built and one for the spanish built.