Chainwheels sizes available

On Jan 30, 4:26 pm, Tom Sherman spake thusly:

Quoted message said:

My RANS Rocket (ISO 406-mm drive wheel) came stock with a
62/52/39-tooth, 130-mm BCD crank.

Yep, dem recumbents got some big 'uns!
http://www.hostelshoppe.com/cgi-bin/readitem.pl?Accessory=1155076891

FWIW: Hostel Shoppe also carries the Vuelta rings in up to 60 teeth at
somewhat lower prices. Another good source is Bike Friday:
http://store.bikefriday.com/index.php?cPath=67&page=7
although I'd agree that a Shimano Capreo system makes it a lot easier
to create "good" gearing with conventional derailleurs.

Jeff

Jeff Wills said:

On Jan 30, 4:26 pm, Tom Sherman spake thusly:

Quoted message said:

My RANS Rocket (ISO 406-mm drive wheel) came stock with a
62/52/39-tooth, 130-mm BCD crank.

Yep, dem recumbents got some big 'uns!
http://www.hostelshoppe.com/cgi-bin/readitem.pl?Accessory=1155076891

Greenspeed items were a lot less expensive in the US when the exchange
rate was about $0.50 USD to the Australian dollar, rather than the
current $0.89 USD!

The rule of thumb used to be $1/tooth for large chainrings.

Quoted message said:

FWIW: Hostel Shoppe also carries the Vuelta rings in up to 60 teeth at
somewhat lower prices. Another good source is Bike Friday:
http://store.bikefriday.com/index.php?cPath=67&page=7
although I'd agree that a Shimano Capreo system makes it a lot easier
to create "good" gearing with conventional derailleurs.

A conventional front road derailer can barely cope with a 62/52/39-tooth
crank and a 11-32 cassette, unless the cage is ground to increase the
radius of the bottom of the side plates.

--
Tom Sherman - Holstein-Friesland Bovinia
"And never forget, life ultimately makes failures of all people."
- A. Derleth

JG said:

Other than having the world's widest crossover gearing, what is the
point of this exercise?  It's hard to imagine the rider and terrain
that could actually make use of  an 18"-125" range on a folding
bike...

JG

Terrain is easy to imagine. Mountains on a loaded touring bike. The
high gear I don't see much use for but some people love to have tall
gears to pedal down the mountains. Heinz Stucke has been touring the
world for the past 45+ years. He is currently using a folding Bike
Friday with panniers. I think Bike Friday sells a lot of their New
World Tourist touring bike just for this reason. Easy to travel and
tour with a compact folding bike.