mjr
Comfy armchair to one person & a plank to the next
- Location
- mostly Norfolk, sometimes Somerset
Disclaimer: I've not got that bike and never had that hub. Right?I've found a local chap who has a gazelle HD, he's kindly letting me have a test ride, though I don't know what size it is.
On looking at the specs they do a 54, then it jumps to a 59 - why no 56/57 ? [...]
Question about the nexus 7 speed hub on the Gazelle:- does it take grease or oil ? What kind ?And how often do you change it ?
Thanks again.
The 5cm jump in frame sizes is probably because traditionally these sort of frames had 2" steps in sizes. If you're really in between sizes, you can futz a bit more with seatposts, stems and bar shapes to get it close enough for most people.
Officially, Nexus 7 hubs take an annual oil bath. Unofficially, semi-fluid grease flooding once and then a half-teaspoon more every few months is the best guess so far - excruciating detail with plenty of freak horror stories (including my own collapsing bearing) and links to other resources like hubstripping at https://forum.cyclinguk.org/viewtopic.php?f=5&t=93935 - but I wouldn't do that if you want to keep the hub warranty as most servicers will probably freak out at the dark grey slime covering everything instead of the official black stuff.
It still had the chaincase on in 