Cycling and bicycle discussion forums. 
   Click here to join our community Log in to access your Control Panel  


Go Back   > >

Fitting Your Bike Are you confused about how you should fit a bike to your particular body dimensions? Have you been reading, found the terms Merxx or French Fit, and don’t know what you need? Every style of riding is different- in how you fit the bike to you, and the sizing of the bike itself. It’s more than just measuring your height, reach and inseam. With the help of Bike Fitting, you’ll be able to find the right fit for your frame size, style of riding, and your particular dimensions. Here ya’ go…..the location for everything fit related.

User Tag List

Reply
 
Thread Tools Search this Thread
Old 01-02-14, 12:29 AM   #1
Crescent Cycle
Senior Member
Thread Starter
 
Join Date: Jan 2014
Bikes:
Posts: 260
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
152mm cranks?

Has anyone with a short inseam tried them? Less than 29" inseam? I supposedly have short femurs too, and the additional saddle to bar drop and opening the thigh/stomach angles is attractive. I think most formulas place me between 152 and 165, but I'm leaning towards the 152s because of the short femurs.

I went from 170 to 165 and was fairly happy, and now I'm thinking about going even shorter. I've seen very little feedback or firsthand experience from riders of upright bicycles though.
Crescent Cycle is offline   Reply With Quote
Old 01-09-14, 10:32 PM   #2
fietsbob 
coprolite
 
fietsbob's Avatar
 
Join Date: Jun 2010
Location: NW,Oregon Coast
Bikes: 7
Posts: 20,358
Mentioned: 9 Post(s)
Tagged: 0 Thread(s)
Quoted: 633 Post(s)
hope you are patient, these 'you go first , then tell me how it was' threads are numerous.
no guts, no glory

Origin 8 offers a range of short cranks for BMX bikes , they are inexpensive , square taper type.
fietsbob is offline   Reply With Quote
Old 01-09-14, 11:49 PM   #3
jyl
Senior Member
 
jyl's Avatar
 
Join Date: Aug 2006
Location: Portland OR
Bikes: 61 Bianchi Specialissima 71 Peugeot G50 7? P'geot PX10 74 Raleigh GranSport 75 P'geot UO8 78? Raleigh Team Pro 82 P'geot PSV 86 P'geot PX 91 Bridgestone MB0 92 B'stone XO1 97 Rans VRex 92 Cannondale R1000 94 B'stone MB5 97 Vitus 997
Posts: 6,954
Mentioned: 10 Post(s)
Tagged: 0 Thread(s)
Quoted: 26 Post(s)
Yes, some Origin 8 BMX cranks will accept double chainrings. I built up a juvenile sized road bike for my son using those cranks in 150 mm.
jyl is offline   Reply With Quote
Old 01-10-14, 08:31 AM   #4
ironwood
Senior Member
 
Join Date: Nov 2009
Location: Boston area
Bikes: 1984 Bridgestone 400 1985Univega nouevo sport 650b conversion 1993b'stone RBT 1985 Schwinn Tempo
Posts: 1,101
Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
Quoted: 15 Post(s)
TA makes 155, 160,and 165mm cranks. www.peterwhitecycles.com
ironwood is offline   Reply With Quote
Old 01-10-14, 08:33 AM   #5
trailmix
Senior Member
 
trailmix's Avatar
 
Join Date: Jun 2013
Location: Lexington, KY
Bikes:
Posts: 514
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 1 Post(s)
Have you thought about 155mm cranks? My mother has a Terry with a 155mm Shimano double and she is 4'11''. Her Cannondale touring bike has 165mm for a little extra leverage.
trailmix is offline   Reply With Quote
Old 01-10-14, 02:14 PM   #6
fietsbob 
coprolite
 
fietsbob's Avatar
 
Join Date: Jun 2010
Location: NW,Oregon Coast
Bikes: 7
Posts: 20,358
Mentioned: 9 Post(s)
Tagged: 0 Thread(s)
Quoted: 633 Post(s)
Some of the cranks for kids were re machined for 2 pedal hole per crank arm

also offered for tandems with a Kid Back add on BB ..
fietsbob is offline   Reply With Quote
Old 01-11-14, 09:01 PM   #7
Crescent Cycle
Senior Member
Thread Starter
 
Join Date: Jan 2014
Bikes:
Posts: 260
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
How does the BMX crank shift and how many speeds do you have it set up for?

I read somewhere the spider is 4.2mm thick instead of 3.5mm thick. Quite a bit of difference.
Crescent Cycle is offline   Reply With Quote
Old 01-11-14, 11:44 PM   #8
fietsbob 
coprolite
 
fietsbob's Avatar
 
Join Date: Jun 2010
Location: NW,Oregon Coast
Bikes: 7
Posts: 20,358
Mentioned: 9 Post(s)
Tagged: 0 Thread(s)
Quoted: 633 Post(s)
As Crank arms Only ... They're a 110 BCD type , so how they shift depends on which chainrings you buy
their sizes and whether they are fully featured with ramps, shift pins and tooth profiles
all engineered to make an easier-quicker shift.

Smallest pitch is TA a 33t, that requires a bit of end of the spider machining to clear them with the chain,

typically a 34t is the smallest.. used

BMX is typically a 1 speed , then shifting is a Non Issue.
fietsbob is offline   Reply With Quote
Old 01-12-14, 12:30 AM   #9
Crescent Cycle
Senior Member
Thread Starter
 
Join Date: Jan 2014
Bikes:
Posts: 260
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
From what I researched on the origin 8 BMX cranks is they can mount double chainrings according to Harris, but they space the chainrings farther out due to a wider spider. That's why I'm asking about the setup and how it shifts.
Crescent Cycle is offline   Reply With Quote
Old 01-19-14, 09:40 PM   #10
byrd48
Senior Member
 
Join Date: May 2012
Location: Atlanta, GA
Bikes: Batavus Course Specialized HardRock x2 Trek 700 MultiTrack 1991 Trek 950 SingleTrack
Posts: 272
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Sugino makes triples in shorter crank lengths, I'm not sure about doubles.
byrd48 is offline   Reply With Quote
Old 01-19-14, 11:07 PM   #11
hamster
Senior Member
 
Join Date: Apr 2006
Location: Escondido, CA
Bikes:
Posts: 2,240
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
I had a 154 mm crank for about 6 months. Switching to 154 from 170 helped with the knees (I was basically just starting riding and I was ramping up the mileage pretty aggressively, and there was some minor knee pain on 170's). I was also unable to spin 170's much higher than 90 rpm, and 154's raised both my optimum cadence and maximum cadence by another 10-15 rpm.
After that I got a new bike with a 172.5 crank and I've been riding on it ever since, put 5k miles on it last year, and did not feel the need for a short crank any longer.
hamster is offline   Reply With Quote
Old 01-20-14, 10:03 AM   #12
jyl
Senior Member
 
jyl's Avatar
 
Join Date: Aug 2006
Location: Portland OR
Bikes: 61 Bianchi Specialissima 71 Peugeot G50 7? P'geot PX10 74 Raleigh GranSport 75 P'geot UO8 78? Raleigh Team Pro 82 P'geot PSV 86 P'geot PX 91 Bridgestone MB0 92 B'stone XO1 97 Rans VRex 92 Cannondale R1000 94 B'stone MB5 97 Vitus 997
Posts: 6,954
Mentioned: 10 Post(s)
Tagged: 0 Thread(s)
Quoted: 26 Post(s)
Quote:
Originally Posted by Crescent Cycle View Post
From what I researched on the origin 8 BMX cranks is they can mount double chainrings according to Harris, but they space the chainrings farther out due to a wider spider. That's why I'm asking about the setup and how it shifts.
My son's bike shifts normally and I used no special components or tricks. Shimano 600 tricolor derailleurs, 50/34 chainrings on the Origin 8 crank.
jyl is offline   Reply With Quote
Reply


Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off



All times are GMT -6. The time now is 08:56 PM.