65 (ish) tooth chainring/chainwheel

For an experimental project, I need a 65 tooth chainring - or, to put it
differently, something between about 63 and 70 teeth. I don't want to
pay a fortune for it. On the other hand it's going to have to put up
with some fairly strong cyclists seeing how hard they can push it, so
it needs to be a reasonable quality part. It's going to have to drive a
9-speed back end, and actually a 53,67 double would be absolutely
ideal.

Where should I look? Presumably small-wheel bikes have chain-rings this
sort of size? Anyone know where I could get one off the shelf?

--
[email hidden] (Simon Brooke) http://www.jasmine.org.uk/~simon/

Morning had broken, and there was nothing left for us to do
but pick up the pieces.

Simon Brooke said:

For an experimental project, I need a 65 tooth chainring - or, to put it
differently, something between about 63 and 70 teeth. I don't want to
pay a fortune for it. On the other hand it's going to have to put up
with some fairly strong cyclists seeing how hard they can push it, so
it needs to be a reasonable quality part. It's going to have to drive a
9-speed back end, and actually a 53,67 double would be absolutely
ideal.

Where should I look? Presumably small-wheel bikes have chain-rings this
sort of size? Anyone know where I could get one off the shelf?

Do you have the software you'd need to design one? I know a really
excellent machinist who'd be able to make one for you.

Chris
--
Chris Eilbeck
MARS Flight Crew http://www.mars.org.uk/
UKRA #1108 Level 2 UYB
Tripoli UK Member #9527 LSMR

Simon Brooke said:

For an experimental project, I need a 65 tooth chainring - or, to put it
differently, something between about 63 and 70 teeth.

Where should I look? Presumably small-wheel bikes have chain-rings this
sort of size? Anyone know where I could get one off the shelf?

I've just taken a 60 off my Bike Friday.

John B

"JohnB" <[email hidden]> wrote in message
news:[email hidden]...

Quoted message said:

Simon Brooke said:

For an experimental project, I need a 65 tooth chainring - or, to put it
differently, something between about 63 and 70 teeth.

Where should I look? Presumably small-wheel bikes have chain-rings this
sort of size? Anyone know where I could get one off the shelf?

I've just taken a 60 off my Bike Friday.

John B

I would have thought you could make one with a dustbin lid and file :-)

Seriously, I saw a MASSIVE chainwheel on a record breaking bike in a museum
in France - there were some pics that showed the rider having to be pushed
to get started as he simply couldn't pedal away from a standstill - IIRC the
rear cog was about an 11 !

RG

Simon Brooke said:

For an experimental project, I need a 65 tooth chainring - or, to put it
differently, something between about 63 and 70 teeth. I don't want to
pay a fortune for it. On the other hand it's going to have to put up
with some fairly strong cyclists seeing how hard they can push it, so
it needs to be a reasonable quality part. It's going to have to drive a
9-speed back end, and actually a 53,67 double would be absolutely
ideal.

Where should I look? Presumably small-wheel bikes have chain-rings this
sort of size? Anyone know where I could get one off the shelf?

recumbents use them. Here's a lead: http://www.ligfietsshop.nl/

Webwinkel, English, parts, drivetrains
---
Marten Gerritsen

INFOapestaartjeM-GINEERINGpuntNL
www.m-gineering.nl

Simon Brooke said:

For an experimental project, I need a 65 tooth chainring - or, to put it
differently, something between about 63 and 70 teeth. I don't want to
pay a fortune for it. On the other hand it's going to have to put up
with some fairly strong cyclists seeing how hard they can push it, so
it needs to be a reasonable quality part. It's going to have to drive a
9-speed back end, and actually a 53,67 double would be absolutely
ideal.

Where should I look? Presumably small-wheel bikes have chain-rings this
sort of size? Anyone know where I could get one off the shelf?

You could try Chris Bell at Highpath Engineering.

http://www.highpath.co.uk

Might be more expensive than you're looking for, as I dunno what you'd
consider a fortune :-)

--
Carol
"Mmmmooooowooooff!" - the Moobark, "The Treacle People"

"Simon Brooke" <[email hidden]> wrote in message
news:[email hidden]...

Quoted message said:

For an experimental project, I need a 65 tooth chainring - or, to put it
differently, something between about 63 and 70 teeth. I don't want to
pay a fortune for it. On the other hand it's going to have to put up
with some fairly strong cyclists seeing how hard they can push it, so
it needs to be a reasonable quality part. It's going to have to drive a
9-speed back end, and actually a 53,67 double would be absolutely
ideal.

Where should I look? Presumably small-wheel bikes have chain-rings this
sort of size? Anyone know where I could get one off the shelf?

One of the recumbent dealers should help. I've supposedly got one on order
with London Recumbents, but it's been 3 weeks or a month and I've heard
nothing, so I'm not holding my breath. I was quoted £54.

I have a TA Cyclotouriste 53/68 chainset on one my recumbents. I think you can still get them from St John Street Cycles?

in message <[email hidden]>, m-gineering

(') said:

Simon Brooke said:

For an experimental project, I need a 65 tooth chainring - or, to put
it differently, something between about 63 and 70 teeth. I don't want
to pay a fortune for it. On the other hand it's going to have to put
up with some fairly strong cyclists seeing how hard they can push it,
so it needs to be a reasonable quality part. It's going to have to
drive a 9-speed back end, and actually a 53,67 double would be
absolutely ideal.

Where should I look? Presumably small-wheel bikes have chain-rings
this sort of size? Anyone know where I could get one off the shelf?

recumbents use them. Here's a lead: http://www.ligfietsshop.nl/

Webwinkel, English, parts, drivetrains

You're a wonderful man. Guide pulleys and chain pipes, as well - I
wondered where I was going to get those.

--
[email hidden] (Simon Brooke) http://www.jasmine.org.uk/~simon/

;; MS Windows: A thirty-two bit extension ... to a sixteen bit
;; patch to an eight bit operating system originally coded for a
;; four bit microprocessor and sold by a two-bit company that
;; can't stand one bit of competition -- anonymous

Simon Brooke said:

in message <[email hidden]>, m-gineering
([email hidden]'😉 wrote:

Quoted message said:

You're a wonderful man. Guide pulleys and chain pipes, as well - I
wondered where I was going to get those.

And single sided hubs.. just what I need for the trailer. I'll need to
work out what other parts I need to make it work.. 20mm axles look
likely.

...d

in message <[email hidden]>, Jon Senior

jon_AT_restlesslemon_DOT_co_DOT_uk ('') said:

Simon Brooke said:

You're a wonderful man. Guide pulleys and chain pipes, as well - I
wondered where I was going to get those.

Depending on how quickly you need the chain tubes, I'm hoping to pick
some up from D-Tek next time I'm down. It might be worth giving Kevin
a call (If you've got at least half an hour to spare!) as his range of
parts for homebuilders was set to increase.

And if you have access to a sheet of aluminium, a pillar drill and
some patience, there is a (Windoze) program online which will print
templates for chainrings.

Thank you, but I was proposing to make only the drop-outs out of
aluminium. I don't really have that much metal working skill.

--
[email hidden] (Simon Brooke) http://www.jasmine.org.uk/~simon/
Ring of great evil
Small one casts it into flame
Bringing rise of Men ;; gonzoron

andhar said:

I have a TA Cyclotouriste 53/68 chainset on one my recumbents. I
think you can still get them from St John Street Cycles?

Not any more, AFAICT. The still do the rings, but only up to 57T.

--
Dave Larrington - <http://www.legslarry.beerdrinkers.co.uk/>
Never give a gun to ducks.