Rishi@Cruzbike
Active Member
The frames can take any weight, but the wheels AND tyres cannot!
For 700C to 26"(559) tyres, the max recommended load per tyre at its max tyre pressure, for Schwalbe tyres is:-
23 mm(70 kg, 145 psi), 28 mm(75 kg, 115 psi), 32 mm(90 kg, 95 psi), 35 mm(100 kg, 95 psi), 38 mm(105 kg, 85 psi), 42 mm(120 kg, 85 psi), 50 mm(130 kg, 70 psi), 60 mm(145 kg, 55 psi).
The T50 can take a 26"*2.3"(60 mm) tyre, and the S40 can take a 700c*38 or 650B*42, OR (26")559*42.
The wheel loads for all Cruzbikes, Front and Rear are very close to 50% with just the rider.
Any luggage on the rear rack goes to the rear wheel load, and approx 75% of the weight of the S40 forward rack to the rear wheel.
Finding the load rating for wheels are MUCH harder, as the hub manufacturers don't state it, and only some rim suppliers do, and they are VERY conservative!
I rode around the South Island of New Zealand, staying in Hostels, with 3 rear Ortlieb bags (20 kg total) , with two under the frame mid way between the wheels(BIG air brakes!!!), so Front wheel load 70 kgs, Rear 76 kgs, using TWE hand built wheels, 32 spoke, 26" rims, 19 mm inside, 25 mm outside, 22 mm deep and 26"*35 mm Kojak tyres(100 kg rated), with no problems.
In 2020 I hope to ride 5,100 km total, 1600 km Van supported, and the rest self supported, in USA and Canada eastern areas.
I will try to have 3 off rear ortlieb, and 1 off front Ortlieb and 4 large Ortlieb pockets(26 kgs), mounted off the rear rack, so the max DESIGN load on the rear wheel will be 97 kg, and 7 kg on the front wheel when no rider. I still have to build the stays and see if the tail wags or not, AND the front wheel ACTUALLY does not get airborne when the rider dismounts!
I am looking to build new wheels from Hope Pro 4 disk hubs with 36 hole, Ryde Andra 30 26" (559) rims as these seem to be the preferred fully loaded Tandem rear rims, and Sapim CX-Ray bladed spokes (so I can use a spoke key to stop the blade turning when tightening the nipple) in a 3 or 4 cross pattern.
Any recommendations for the 100 Kg 100 mm non drive wheel???
The drive front wheel will be the same spec, to allow for braking loads, which could reach 150 kgs, if emergency braking lifts the rear wheel off the ground with a 185 mm front disk!!!!
Thanks!
As I'm right now the combined weight for me, when commuting on the S40, would be 110-115 kgs. On the electric T50 I'm planing to build would be higher. Also I was not sure if I should let my heavier acquaintances try the S40 I'm sure I'll get a lot of requests to try the bikes.