Elevation profile discrepancies

[livpoksoc]

I.ve just ordered an I-GOTU GT-820 Pro Bluetooth Wireless GPS from an ebay seller, £24.99 posted. No idea how good it will be but it's cheap enough and gives me a bike computer without faffing around with sensors and wheel magnets.

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Tbf @£25 it's worth a punt. Probably missing the courses bit for me.

 

[Dogtrousers]

Fair point...I need to find something appropriate. Either way double the real elevation on my Edge is doing my bonce.

In the meantime ... while you're figuring it out ... just ride up lots and lots of hills.

 

[Bollo]

To give you some idea, most rides west/south west of Amazingstoke will usually pack in about 100m+ per 10km (approx 500ft+ per 10 miles). If you go hill-hunting towards Hannington, White Down Hill, Watership Down or further afield across the A34 towards Walbury, you can almost double that.

Even if the local terrain doesn't exactly match the pru, the constant up-and-downs work well as interval-training as you switch between intense efforts and recoveries.

 

[Smokin Joe]

Tbf @£25 it's worth a punt. Probably missing the courses bit for me.

Arrived yesterday, returned today as it would not switch on. Edge 25 from Aldi purchased this AM.

Ah well, cheap for a reason

 

[andyoxon]

Interestingly, if one edits teh gpx file generated by an older Garmin Etrex to be creator = "etrex with barometer" (i.e. with magic word barometer) the elevation in Strava is e.g. ~1350m as opposed to ~1000m (without the word barometer). 1350m being closer to the ridewithgps elevation of ~1250m (with no gpx edit). perhaps the Strava map elevation data which it uses in the 'absence' of barometric data under estimates true elevation.

 

[Siclo]

Interestingly, if one edits teh gpx file generated by an older Garmin Etrex to be creator = "etrex with barometer" (i.e. with magic word barometer) the elevation in Strava is e.g. ~1350m as opposed to ~1000m (without the word barometer). 1350m being closer to the ridewithgps elevation of ~1250m (with no gpx edit). perhaps the Strava map elevation data which it uses in the 'absence' of barometric data under estimates true elevation.

Even more interestingly, plot the route on strava route planner, the climb will be 1350m, ride it with an etrex 30 with barometer the climb will be about 1350m, load it without you fix and it'll come out at 1000m, then reload it with your fix and it'll be what you got on the etrex

 

[livpoksoc]

That pattern does not replicate the pru. The first 50 is very flat, then the hills kick in, 3 big one over 30 miles then a long flat 20 back to London with a small nasty kick at Wimbledon.

The mental thing you want is a long steep climb on tired legs. 10 mile splits @300ft is gently rolling.

Thanks for the advice, did just that today. Did my same ride as last week but added a 7 mile detour over a decent 350ft climb over 2.5 miles. Mental barrier broken a bit as I had to push the bike over that climb three weeks ago.