Time needed to reach each level with each wheel
It takes 2.7 seconds to travel 1ft without a wheel.
level | Lucid Lagoon | Spooky Spires | Growling Grotto | Fluorescent Fountain | The Deep Deep |
depth (ft) | 100 | 300 | 600 | 1000 | 1500 |
no wheel | 4m 30s | 13m 30s | 27m | 45m | 1h 7m 30s |
copper | 39s | 1m 56s | 3m 51s | 6m 26s | 9m 39s |
iron | 30s | 1m 30s | 3m | 5m | 7m 30s |
silver | 21s | 1m 2s | 2m 5s | 3m 28s | 5m 12s |
mithril | 17s | 51s | 1m 41s | 2m 49s | 4m 13s |
lorium | 10s | 31s | 1m 2s | 1m 44s | 2m 36s |
chaosium | 9s | 28s | 56s | 1m 33s | 2m 20s |
gold | 8s | 23s | 45s | 1m 15s | 1m 53s |
Speed multipliers
Copper: 7
Iron: 9
Silver: 13
Mithril: 16
Lorium: 26
Chaosium: 29
Gold: 36
Wheel durability
Iron: 1,200ft (6 minutes, 6 trips to LL and back)
Mithril: around 8,400ft ???
Lorium: around 16,666ft ???
Chaosium, Gold: 18,000ft (22.5 minutes, 9 trips to FF and back, 6 trips to DD and back)