rec.sport.unicycling · Public discussion

My ultimate cotterless muni cranks

mark williamson · 2007-06-15T16:38:34+00:00

I've recently perfected some uber cranks for my cotterless muni. 'Cotterless uber cranks' (http://tinyurl.com/yq64zr) These are adapted for the particular uses I'm interested in: - Double drilled for pedal holes - 150mm and 127mm - Self extracting crank bolts (remove and fit cranks using only a 6mm hex key) - Lightweight alloy to be easily carried when not in use The drilling / tapping was done by an engineer friend of the LBS. The job cost £20, but that included modifications to accommodate a calliper brake on my frame. The self extracting crank bolts were made by Specialities TA and cost £10 (note: out of a number of pairs, I had one faulty set which I obtained some Shimano replacement parts for, so the bolts shown do not use the original TA top washer or dustcap). The self extractor makes it fairly easy to swap these cranks off entirely, either before leaving home or whilst out on a ride. I have several sets of self extracting bolts. Right now I have some 90mm cranks on my 29er, but I can swap the muni cranks back on using a 6mm hex key, plus a spanner to move the pedals across. Overall I'm hoping the ability to change pedal holes, and change to short length road cranks, will make for an ideal long range muni machine for rides too difficult or muddy to take the 36er. I'm particularly pleased with the self extracting bolts, since I didn't know these were available for tapered axles until I recently saw them mentioned in a forum post here... -- mark williamson Dave: Just a question. What use is a unicyle with no seat? And no pedals! Mark: To answer a question with a question: What use is a skateboard? Dave: Skateboards have wheels. Mark: My wheel has a wheel! ------------------------------------------------------------------------ mark williamson's Profile: http://www.unicyclist.com/profile/11301 View this thread: http://www.unicyclist.com/thread/61735 Posted Via Usenet.com Premium Usenet Newsgroup Services ---------------------------------------------------------- ** SPEED ** RETENTION ** COMPLETION ** ANONYMITY ** ---------------------------------------------------------- http://www.usenet.com

Started by mark williamson · 15 June 2007 · Last activity 16 June 2007 · 8 posts · 130 views

← Back to rec.sport.unicycling

Thread navigation

Jump through the discussion

Go to the original post, the replies on this page, or the latest preserved contribution.

01 / Original postMy ultimate cotterless muni cranksmark williamson · 15 Jun 2007 02 / This pagePosts 1–8Page 1 of 1 · chronological order 03 / Latest replyPost #8Borgschulze · 16 Jun 2007

Thread details

What we know about this thread

Original section: rec.sport.unicycling
Published: 15 June 2007
Last activity: 16 June 2007
Original author: mark williamson
Posts: 8
Discussion status: Public discussion
Total views: 130
Views / 30 days: 0
Topics: Short cranks Taper and peaking

The navigation and discussion metadata provide context. Posts remain in their original chronological order.

Original post
mark williamson
Archived post

15 June 2007, 16:38 UTC #1

I've recently perfected some uber cranks for my cotterless muni.
'Cotterless uber cranks' (http://tinyurl.com/yq64zr) These are
adapted for the particular uses I'm interested in:
- Double drilled for pedal holes - 150mm and 127mm
- Self extracting crank bolts (remove and fit cranks using only a 6mm
hex key)
- Lightweight alloy to be easily carried when not in use
The drilling / tapping was done by an engineer friend of the LBS. The
job cost £20, but that included modifications to accommodate a calliper
brake on my frame. The self extracting crank bolts were made by
Specialities TA and cost £10 (note: out of a number of pairs, I had one
faulty set which I obtained some Shimano replacement parts for, so the
bolts shown do not use the original TA top washer or dustcap).
The self extractor makes it fairly easy to swap these cranks off
entirely, either before leaving home or whilst out on a ride. I have
several sets of self extracting bolts. Right now I have some 90mm
cranks on my 29er, but I can swap the muni cranks back on using a 6mm
hex key, plus a spanner to move the pedals across.
Overall I'm hoping the ability to change pedal holes, and change to
short length road cranks, will make for an ideal long range muni
machine for rides too difficult or muddy to take the 36er. I'm
particularly pleased with the self extracting bolts, since I didn't
know these were available for tapered axles until I recently saw them
mentioned in a forum post here...
--
mark williamson
Dave: Just a question. What use is a unicyle with no seat? And no
pedals!
Mark: To answer a question with a question: What use is a skateboard?
Dave: Skateboards have wheels.
Mark: My wheel has a wheel!
------------------------------------------------------------------------
mark williamson's Profile: http://www.unicyclist.com/profile/11301
View this thread: http://www.unicyclist.com/thread/61735
Posted Via Usenet.com Premium Usenet Newsgroup Services
----------------------------------------------------------
** SPEED ** RETENTION ** COMPLETION ** ANONYMITY **
----------------------------------------------------------
http://www.usenet.com

Report
Uniman_3
Archived post

15 June 2007, 16:47 UTC #2

awesome!!
--
Uniman_3
Words are made to strike the minds of the unsuspecting.
------------------------------------------------------------------------
Uniman_3's Profile: http://www.unicyclist.com/profile/14387
View this thread: http://www.unicyclist.com/thread/61735
Posted Via Usenet.com Premium Usenet Newsgroup Services
----------------------------------------------------------
** SPEED ** RETENTION ** COMPLETION ** ANONYMITY **
----------------------------------------------------------
http://www.usenet.com

Report
thejdw
Archived post

15 June 2007, 18:56 UTC #3

cool, splinned next?
--
thejdw
dunawan said:
why are koxx one unicycles so costly???
forrestunifreak said:
They are expensive because they use only the finest soft drink cans.
Quoted message said:
Quoted message said:
don't follow Jesus, follow me!<<

------------------------------------------------------------------------
thejdw's Profile: http://www.unicyclist.com/profile/13230
View this thread: http://www.unicyclist.com/thread/61735
Posted Via Usenet.com Premium Usenet Newsgroup Services
----------------------------------------------------------
** SPEED ** RETENTION ** COMPLETION ** ANONYMITY **
----------------------------------------------------------
http://www.usenet.com

Report
Qweld
Archived post

16 June 2007, 15:27 UTC #4

Do you ever catch your heel or toe with on the end when your set for the
short crank distance??
--
Qweld
Flats blow
------------------------------------------------------------------------
Qweld's Profile: http://www.unicyclist.com/profile/14883
View this thread: http://www.unicyclist.com/thread/61735
Posted Via Usenet.com Premium Usenet Newsgroup Services
----------------------------------------------------------
** SPEED ** RETENTION ** COMPLETION ** ANONYMITY **
----------------------------------------------------------
http://www.usenet.com

Report
mark williamson
Archived post

16 June 2007, 16:13 UTC #5

Qweld said:
Do you ever catch your heel or toe with on the end when your set for the
short crank distance??
Not whilst riding, so far. Whilst mounting I guess you could, but I
haven't noticed it beyond my usual "sorting out foot position whilst
riding" start 🙂 With a 150mm / 127mm set up there's actually very
little crank exposed beyond the pedal. That said, it's probably even
more important to tuck your laces in - wouldn't want those getting
caught on the end!
For really short settings I'm using single length 90mm cranks, and
swapping them using the self extraction mechanism, so I can get a
really high speed setting without having loads of excess crank sticking
out.
--
mark williamson
Dave: Just a question. What use is a unicyle with no seat? And no
pedals!
Mark: To answer a question with a question: What use is a skateboard?
Dave: Skateboards have wheels.
Mark: My wheel has a wheel!
------------------------------------------------------------------------
mark williamson's Profile: http://www.unicyclist.com/profile/11301
View this thread: http://www.unicyclist.com/thread/61735
Posted Via Usenet.com Premium Usenet Newsgroup Services
----------------------------------------------------------
** SPEED ** RETENTION ** COMPLETION ** ANONYMITY **
----------------------------------------------------------
http://www.usenet.com

Report
hobo_chuck
Archived post

16 June 2007, 17:29 UTC #6

Soooo......i suppose you aren't doing any drops too big....
--
hobo_chuck
😕
its not easy being gold!
😕 '$200 KH 29\" mountain uni!' (http://www.lost.eu/53187)
get yours before it's too late!!
------------------------------------------------------------------------
hobo_chuck's Profile: http://www.unicyclist.com/profile/14113
View this thread: http://www.unicyclist.com/thread/61735
Posted Via Usenet.com Premium Usenet Newsgroup Services
----------------------------------------------------------
** SPEED ** RETENTION ** COMPLETION ** ANONYMITY **
----------------------------------------------------------
http://www.usenet.com

Report
mark williamson
Archived post

16 June 2007, 18:03 UTC #7

hobo_chuck said:
Soooo......i suppose you aren't doing any drops too big....
These are really for distance riding - an XC 29er or a 36" - so big
drops aren't what they get used for anyhow. That said, it's a UDC wide
hub - they're pretty strong so it can probably stand up to decent sized
drops. Fairly few people have actually broken these hubs.
I'll probably get a splined setup at some point but that'll either be
a) a street / trials uni or b) I'd change the 29er to a splined hub if
the wear caused to the tapers by repeated crank changes proves too
much.
--
mark williamson
Dave: Just a question. What use is a unicyle with no seat? And no
pedals!
Mark: To answer a question with a question: What use is a skateboard?
Dave: Skateboards have wheels.
Mark: My wheel has a wheel!
------------------------------------------------------------------------
mark williamson's Profile: http://www.unicyclist.com/profile/11301
View this thread: http://www.unicyclist.com/thread/61735
Posted Via Usenet.com Premium Usenet Newsgroup Services
----------------------------------------------------------
** SPEED ** RETENTION ** COMPLETION ** ANONYMITY **
----------------------------------------------------------
http://www.usenet.com

Report
Borgschulze
Archived post

16 June 2007, 18:42 UTC #8

They look similar to my bike cranks, but those are specialized, and made
from cast steel.
[image:
http://i124.photobucket.com/albums/p37/Borgschulze/DSCF0156.jpg?t=1182019353]
I posted it because, these cranks have been ridden by the worst hard
landing biker in my city, my long time friend Nate, it's the only part
on his bike that he -didn't- break... I'm just saying, my cranks are
REALLY strong, and yours are a similar design, but I believe they're
aluminum? Either way, it's a good crank design.
--
Borgschulze
http://borgschulze.deviantart.com/
------------------------------------------------------------------------
Borgschulze's Profile: http://www.unicyclist.com/profile/13501
View this thread: http://www.unicyclist.com/thread/61735
Posted Via Usenet.com Premium Usenet Newsgroup Services
----------------------------------------------------------
** SPEED ** RETENTION ** COMPLETION ** ANONYMITY **
----------------------------------------------------------
http://www.usenet.com

Report

Active in the last 60 minutes

Active in this thread

0 users · 0 guests ·0 bots ·0 total

No signed-in users are active right now.

No known search crawlers active right now.

Jump through the discussion

What we know about this thread

Continue through CyclingForums

Active in this thread