Schwable Rapid Rob tyres
Stoney01
Posts: 7
Has anyone had problems with Schwable Rapid Rob 26 x 2.25" tyres being less than expected width......<2.1"???
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Comments
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Tyres are rarely the size on the packet. Rapid robs are cheaper end, so probably likely to come up small to save a bit on rubber. Depends on rim width too.A Flock of Birds
+ some other bikes.0 -
and then there is the meathod of measurement.
carcass or Knobs."Do not follow where the path may lead, Go instead where there is no path, and Leave a Trail."
Parktools :?:SheldonBrown0 -
Sorry but i thought this was a serious question be to shared with knowledgeable persons for a sensible response....not friggin muppets!
Yes, these are low end spec but thats not the point. several tyres were Measured at same pressures on identical rims against original tyres using a digital vernier caliper by a competent person!
No problems found with older tyres but 3 brand new tyres from different sources were found to be all under 2.1", which is less than the ETRTO minimum tolerances. Awaiting a response from Manufacturer.0 -
Stoney01 wrote:Sorry but i thought this was a serious question be to shared with knowledgeable persons for a sensible response....not friggin muppets!
I don't see anything wrong with the 2 answers you received.
Benpinnick is stating observations and nicklouse is questioning where the measurement datum points are.
Calling them 'friggin muppets' isn't the best way to introduce yourself to a forum.“Life has been unfaithful
And it all promised so so much”
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Wow, wind your neck in a bit eh!?
There is no standard way of measuring a tyre, and very very few come up exactly as sized. This is nothing new. I don't really know what you expect from the manufacturer, sure they'll have a way of measuring them as claimed. A 2.25" Schwalbe is bigger than a 2.1" and smaller than a 2.4", that's about it...
Compare an old Tioga Factory DH 2.1" to an old Panaracer Fire XC 2.1" and they're not even close to being the same size. It's not the age of the tyre, there's just no standard.0 -
Fair point and a little over reaction to a Knob comment but my grovelling apologies for any offence!
Totally understand comments on different tyres, variance in manufacturing process and other factors. These are all the same make, measured accurately across carcass width, clear of any tread profile. Very noticeable difference visually and although stamped as 2.25 they are equal or less than the 2.1 versions.0 -
Stoney01 wrote:Fair point and a little over reaction to a Knob comment but my grovelling apologies for any offence!
Totally understand comments on different tyres, variance in manufacturing process and other factors. These are all the same make, measured accurately across carcass width, clear of any tread profile. Very noticeable difference visually and although stamped as 2.25 they are equal or less than the 2.1 versions.
some reading for you http://www.schwalbetires.com/tech_info/ ... ions#ETRTO"Do not follow where the path may lead, Go instead where there is no path, and Leave a Trail."
Parktools :?:SheldonBrown0 -
Fit a 2.25" tyre to a 17mm rim and then a 28mm rim and you get 2 different widths....which would you like to be used when quoting the width?Currently riding a Whyte T130C, X0 drivetrain, Magura Trail brakes converted to mixed wheel size (homebuilt wheels) with 140mm Fox 34 Rhythm and RP23 suspension. 12.2Kg.0
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Identical rims and tubes used to eliminate error
Fill volume to pressurise new tyres versus old is also far less0 -
So we come full circle to thisnjee20 wrote:This is nothing new. I don't really know what you expect from the manufacturer, sure they'll have a way of measuring them as claimed. A 2.25" Schwalbe is bigger than a 2.1" and smaller than a 2.4"0
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Stoney01 wrote:Identical rims and tubes used to eliminate error
Fill volume to pressurise new tyres versus old is also far less
There are no accepted standards, so maybe each manufacturer already does the fitting of each size to a matching rim size - just no need to tell us what.
Write a standard that will work and then you'll get some credability.......Currently riding a Whyte T130C, X0 drivetrain, Magura Trail brakes converted to mixed wheel size (homebuilt wheels) with 140mm Fox 34 Rhythm and RP23 suspension. 12.2Kg.0 -
Stoney01 wrote:Awaiting a response from Manufacturer.
wait...
HAHAHAHAHAHAHAHAHAH0 -
I suggest a strongly worded letter to the Mail.I don't do smileys.
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Parktools0 -
Stoney01 wrote:Fair point and a little over reaction to a Knob comment but my grovelling apologies for any offence!
Haha wait a minute did you think he was calling you a knob? He's stating that it depends also on if you're measuring the tyre carcass itself or from how wide the knobs extend beyond that. As different manufacturers likely do or don't do this. Maybe tread instead of knobs would've been a better choice!0 -
Nope, knob was about right0
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Thanks for those who gave the constructive comments.
Doesn't really matter where the width was measured in this particular case, carcass, treads or "knobs" for that matter. The purpose was was a genuine post to see if anyone had come across the same problem with the same tyre.
The difference was around 6mm less in width on 3 recently supplied new tyres against 3 older tyres of the same make/model on the same rims at the same pressure, with the wider tyre appearing to be no different to the narrower version of the same make/model being sold. Looked a bit suspect, hence the straight question if anyone else had noticed.0 -
Maybe if you'd put the wider tyres on the wider rims the manufacturer measures it on it would have come up wider.....
Nothing your saying is news (as in new information).....Currently riding a Whyte T130C, X0 drivetrain, Magura Trail brakes converted to mixed wheel size (homebuilt wheels) with 140mm Fox 34 Rhythm and RP23 suspension. 12.2Kg.0 -
To be fair I think some people are misreading it, I must say I've never seen a marked variation in a single tyre - I've had about 5 pairs of Rocket Rons and whilst they vary hugely compared to other 2.1"s they're all about the same as each other.
If there's a significant time gap perhaps they've changed the carcass, but Robs haven't been around very long.0 -
ddraver wrote:I ve never measured a tire before...why would you?
Raised by a customer, side by side they were visually and very noticeably different, not what was considered to be a minor or typical variation, hence asking the question. Age between old and new tyres was <12 months. If they were different makes on different rims we wouldn't have bothered!0 -
Probably produced in completely different factories with different tooling.
6mm is hardly going to be noticeable when riding though. Put the fatter one on the front and jobs a good'n.0 -
I have had the same problem. I bought 16 Rapid robs and when. I opened one of the boxes it was a 1.2 with no 'knobs'.
Its thinner than the rim. I look a right knob.0