Road Cycling

FrenchTart · 29 Jul 2015 at 21:13

tedmaul said:
That says I should be running my 25mm GP4000s at 62 front and 77 rear. Surely not?! I'd be bouncing all over the shop and getting pinch flats all the time on our crappy roads.

So what is your weight and bike weight?

FrenchTart · 29 Jul 2015 at 21:14

Jonny ///M said:
23c gp4000 at 110r 100f for me. Grippy as and notably comfier to ride than an equivalent gatorskin.

That's not really a fair comparison. I find riding on tyres more enjoyable than riding on rat turd too.

tedmaul · 29 Jul 2015 at 21:24

FrenchTart said:
So what is your weight and bike weight?

I weigh 64kg. Bike is about 8kg. Plus I added a few kilos for stuff I wear.

James07 said:
Any idea what I could use? Need some sharpish tbh.

Defy is a total pain in the arse for guards. I think only the giant own brand and cruds will fit. And I couldn't get either to fit on 25mm tyres so I have to run 23s. It's the clearance under the brakes - it's crap.

FrenchTart · 29 Jul 2015 at 21:30

tedmaul said:
I weigh 64kg. Bike is about 8kg. Plus I added a few kilos for stuff I wear.

I just put in 165lbs and got similarly surprisingly low figures. Maybe it's not quite as good for lighter riders (when I worked out mine I was at just over 80kg + ~10kg for bike + equipment).

That said, if I don't get pinch flats on awful Manchester "roads" at 90-95 psi at 15-20kg heavier than you I can't imagine you need to run as high a psi as I do.

tedmaul · 29 Jul 2015 at 21:35

FrenchTart said:
I just put in 165lbs and got similarly surprisingly low figures. Maybe it's not quite as good for lighter riders (when I worked out mine I was at just over 80kg + ~10kg for bike + equipment).

That said, if I don't get pinch flats on awful Manchester "roads" at 90-95 psi at 15-20kg heavier than you I can't imagine you need to run as high a psi as I do.

Yeah, you could be right. I tend to run them at 90 front and rear. But after a week I can start to feel the wee bit of pressure loss in the rear so wouldn't want to be running less than that.

FrenchTart · 29 Jul 2015 at 21:36

tedmaul said:
Yeah, you could be right. I tend to run them at 90 front and rear. But after a week I can start to feel the wee bit of pressure loss in the rear so wouldn't want to be running less than that.

I notice similar in my rear tyre too. On the other hand, I've had times where I was really lazy and it got down to about 60 psi without any issues so perhaps we both need to adjust our perception (or I just got lucky that time

).

daveski · 29 Jul 2015 at 21:42

So last week I picked up a tandem I was offered for a bargain price.

After replacing the tyres and tubes a couple of mates took it for a test ride tonight

FrenchTart · 29 Jul 2015 at 21:43

Until I see a photoshopped picture of you riding front seat and back seat it's no sale I'm afraid.

Dunks · 29 Jul 2015 at 21:57

daveski said:
So last week I picked up a tandem I was offered for a bargain price.

After replacing the tyres and tubes a couple of mates took it for a test ride tonight

I'll have to keep a look out

James07 · 29 Jul 2015 at 22:01

SDK^ said:
I was waiting for this update but I found a very useful tip earlier this week which does the same thing and works great. Edge 810 or 1000 required. Also, doesn't require a premium Strava account.

Summary: Copy your Strava segment URL to this site: http://gniza.org/segments/#/, select the time from the list you want to download (KOM or your PR), click the Export as FIT file, copy the segment file to your Garmin 'New files' directory and that's it.
Then when you're out riding and you get close to that segment it will count you down to the start, show GO and track your position ahead/behind in seconds. Works on the map view, elevation and virtual partner screens.

This is brilliant and exactly why I want a Garmin, such a fantastic aid! We need this on phones.

tedmaul said:
Defy is a total pain in the arse for guards. I think only the giant own brand and cruds will fit. And I couldn't get either to fit on 25mm tyres so I have to run 23s. It's the clearance under the brakes - it's crap.

Urgh. The clearance is tight, I were looking earlier. Have you got the same brakes as me?

daveski said:
So last week I picked up a tandem I was offered for a bargain price.

After replacing the tyres and tubes a couple of mates took it for a test ride tonight

Saw this on Strava. Brilliant

Jonny ///M · 29 Jul 2015 at 22:06

https://4.bp.blogspot.com/-Iq-hgstS5kk/VGOLUqkfuHI/AAAAAAAAAdI/ImDEofhVh3o/s1600/PDW+FULL+BIKE.JPG

Think they will fit the defy .

daveski · 29 Jul 2015 at 22:09

Dunks said:
I'll have to keep a look out

Come round and give it a try. It's awesome.

James07 · 29 Jul 2015 at 22:13

Jonny ///M said:
https://4.bp.blogspot.com/-Iq-hgstS5kk/VGOLUqkfuHI/AAAAAAAAAdI/ImDEofhVh3o/s1600/PDW+FULL+BIKE.JPG

Think they will fit the defy .

Which are those?

slipd · 29 Jul 2015 at 22:24

Thanks for all the input re: my pressures guys...

At 80psi the tyre is only very slightly touching the fork and only at a certain point during the turn. It really probably is only a couple of mm! It's got me thinking, could there be a buckle or alignment issue with my wheel? If so, do I need to get it to some professionals or is there anything I can do

James07 · 29 Jul 2015 at 22:26

Which direction is it rubbing? Side to side?

Probs best to get a shop to look at it if you ain't too wise up on maintenance

Saytan · 29 Jul 2015 at 22:27

slipd said:
Thanks for all the input re: my pressures guys...

At 80psi the tyre is only very slightly touching the fork and only at a certain point during the turn. It really probably is only a couple of mm! It's got me thinking, could there be a buckle or alignment issue with my wheel? If so, do I need to get it to some professionals or is there anything I can do

what frame and fork is it? most stuff will clear a 25 these days

slipd · 29 Jul 2015 at 22:30

I've got a Scott Speedster; http://www.evanscycles.com/products/scott/speedster-30-compact-2014-road-bike-ec054452 - XXL frame though.

The rub appears to only be on one side, the right as you look from the front of the bike

Saytan · 29 Jul 2015 at 22:32

that would suggest something is not right

Try turning the wheel around and see if the rub follows the wheel

slipd · 29 Jul 2015 at 22:40

^^ Sorry, I'm not meaning to sound daft but what do you mean? As I spin the wheel, the rub is only really audible once a turn.

SoliD · 29 Jul 2015 at 22:43

slipd said:
^^ Sorry, I'm not meaning to sound daft but what do you mean? As I spin the wheel, the rub is only really audible once a turn.

Sounds like your wheel is out of true to me. Ie buckled.