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Postby swaz » Mon Aug 01, 2016 6:32 am
Postby grantw » Mon Aug 01, 2016 7:19 am
Postby Nobody » Mon Aug 01, 2016 8:37 am
Postby richbee » Mon Aug 01, 2016 8:38 am
Postby swaz » Mon Aug 01, 2016 8:43 am
richbee wrote: Road pedals have a larger contact area
Postby trailgumby » Mon Aug 01, 2016 9:09 am
richbee wrote:Because the the $himaNO mtb pedals you've shown concentrate pressure into very small area which gets very uncomfortable very quickly, and unbearable on a longer ride.
Nobody wrote:I have a knee issue which responds reasonably well to a specific setup afforded by Speedplay Zero pedals. To get the same approximate float with the SPDs (used on the wet bike) requires the spring tension to be quite light....
Postby swaz » Mon Aug 01, 2016 9:15 am
trailgumby wrote:richbee wrote:Because the the $himaNO mtb pedals you've shown concentrate pressure into very small area which gets very uncomfortable very quickly, and unbearable on a longer ride.
Only with cheap shoes with flexy soles.Not a problem with decent carbon soles.
I found SPD-SL pedals were just dangerous in traffic. Too hard to get into - if you missed hooking your cleat in, you were stuck with your foot on top of a slippery pedal and it very easily slipped off and did a digger into the pavement. Not good for your ankles, and going OTB in front of a tailgating bus is not the way I want to make the evening news. Either that, or it was multiple digs at the pedal, and with the stress of that grumpy cabbie on your six it was just messy.
Postby human909 » Mon Aug 01, 2016 9:26 am
trailgumby wrote:Only with cheap shoes with flexy soles.Not a problem with decent carbon soles.
trailgumby wrote:At first I thought it was just me, but then I noticed that a sizable number of experienced road riders have exactly the same experience taking off from traffic lights.
Postby X-ray » Mon Aug 01, 2016 9:30 am
swaz wrote:richbee wrote: Road pedals have a larger contact area
I would imagine that given the stiffness of even the most basic road shoe that this is a moot point being that the 'load' would be spread evenly out across the sole. Not saying I am right and I am interested in opinions.
Postby kb » Mon Aug 01, 2016 9:40 am
human909 wrote:trailgumby wrote:Only with cheap shoes with flexy soles.Not a problem with decent carbon soles.
Exactly. The nonsense about smaller contact area doesn't make sense unless you have terrible shoes. Afterall the contact area is focussed back onto the small pedal spindle anyway.
(I have reasonably cheapish shimano shoes with non carbon soles even then I don't notice any pressure hot spots. (Not doubt they are plenty heavier shoes than road shoes or carbon sole shoes though.)
Postby richbee » Mon Aug 01, 2016 9:54 am
trailgumby wrote:Only with cheap shoes with flexy soles.Not a problem with decent carbon soles.
Postby eeksll » Mon Aug 01, 2016 10:23 am
Postby BJL » Mon Aug 01, 2016 10:24 am
richbee wrote:trailgumby wrote:Only with cheap shoes with flexy soles.Not a problem with decent carbon soles.
Nope, it's to do with the force applied against the area on which the force acts. The stiffer road soles do allow for a greater transfer of power from foot to pedal than a more flexible sole, but the force is still acting on a concentrated area the pressure is still there, and will be felt. Even with the stiffest of soles the pressure cannot be distributed at a greater than 45 degree angle. What the stiffer sole does do however is allow the manufacturers to make them thinner and hence lighter.
Postby g-boaf » Mon Aug 01, 2016 10:31 am
richbee wrote:Because the the $himaNO mtb pedals you've shown concentrate pressure into very small area which gets very uncomfortable very quickly, and unbearable on a longer ride.
Postby human909 » Mon Aug 01, 2016 10:37 am
richbee wrote:Nope, it's to do with the force applied against the area on which the force acts. The stiffer road soles do allow for a greater transfer of power from foot to pedal than a more flexible sole, but the force is still acting on a concentrated area the pressure is still there, and will be felt.
richbee wrote:Even with the stiffest of soles the pressure cannot be distributed at a greater than 45 degree angle. What the stiffer sole does do however is allow the manufacturers to make them thinner and hence lighter.
Postby Nobody » Mon Aug 01, 2016 10:48 am
trailgumby wrote:@Nobody, for MTB have you had a look at the new Speedplay Syzr?
Postby trailgumby » Mon Aug 01, 2016 11:00 am
human909 wrote:richbee wrote:Even with the stiffest of soles the pressure cannot be distributed at a greater than 45 degree angle. What the stiffer sole does do however is allow the manufacturers to make them thinner and hence lighter.
This is 100% false. It is not in accordance with fundamental physics and engineering.
If you were right then it is a puzzle how every beam in buildings and structures other across the world work. In fact how do you suppose pedals transfer their load to the cranks?
Postby trailgumby » Mon Aug 01, 2016 11:07 am
Nobody wrote:As an aside, I don't do a lot of MTB anymore. As I get closer to 50 yo, I'm getting more worried about injuries and the complications of tick bites.
http://www.news.com.au/lifestyle/health ... 0793806548
http://www.karlmcmanusfoundation.org.au ... me-disease
Postby ball bearing » Mon Aug 01, 2016 11:08 am
Postby Comedian » Mon Aug 01, 2016 11:10 am
Postby Nobody » Mon Aug 01, 2016 11:16 am
richbee wrote:trailgumby wrote:Only with cheap shoes with flexy soles.Not a problem with decent carbon soles.
Nope, it's to do with the force applied against the area on which the force acts...
Postby g-boaf » Mon Aug 01, 2016 12:27 pm
ball bearing wrote:The new carbon 105 pedals are far more clip in friendly, in my experience. The old metal version would hang at a very awkward angle.
I do have one road bike set up with SPD and flat bars for family rides. Otherwise I prefer SPD-SL for road cycling.
Postby mikgit » Mon Aug 01, 2016 12:41 pm
Comedian wrote:I don't like the whole shimano wear out throw away thing so I use double sided speedplays. You have to grease them occasionally - but I'm still using the same pedals 5 years on and should I need parts I can get them.
Postby Trevtassie » Mon Aug 01, 2016 12:42 pm
richbee wrote:trailgumby wrote:Only with cheap shoes with flexy soles.Not a problem with decent carbon soles.
Nope, it's to do with the force applied against the area on which the force acts. The stiffer road soles do allow for a greater transfer of power from foot to pedal than a more flexible sole, but the force is still acting on a concentrated area the pressure is still there, and will be felt. Even with the stiffest of soles the pressure cannot be distributed at a greater than 45 degree angle. What the stiffer sole does do however is allow the manufacturers to make them thinner and hence lighter.
Postby richbee » Mon Aug 01, 2016 1:06 pm
Trevtassie wrote:Really, 45 degrees? Best you go google some basic engineering principles. Here's a hint... Bridges don't have the piers spaced so the force vectors are at 45 degrees
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