Fitting a 700 x 25 tyre on a 19 -622 rim - possible & which should have more tread front or rear?

[StuUngar]

Hi,
I have looked up Sheldon's tyre / rim chart & he says that 28 is the "safe" size for this rim. Unfortunately I only have a new 25 - at present they have 37s on.

Just wondering if it is possible to fit a 25 on these rims or a total no go? It's a Marathon Plus so they are hard to fit anyway and don't want to go to the effort only for something to go awry!

Also the tyres I already have Conti sport contacts are somehow still holding up but are completely bald. With greasy roads & wet leaves it ain't much fun! Is it better to put the new tyre with decent tread on front or rear?

Thanks in advance for any advice

 

[HLaB]

I'm no sure the consequences of putting too narrow a tyre on but always put the best tyre on the front, a rear blow out is controllable a front less so.

 

[sreten]

Hi,
I have looked up Sheldon's tyre / rim chart & he says that 28 is the "safe" size for this rim. Unfortunately I only have a new 25 - at present they have 37s on.

Just wondering if it is possible to fit a 25 on these rims or a total no go? It's a Marathon Plus so they are hard to fit anyway and don't want to go to the effort only for something to go awry!

Also the tyres I already have Conti sport contacts are somehow still holding up but are completely bald. With greasy roads & wet leaves it ain't much fun! Is it better to put the new tyre with decent tread on front or rear?

Thanks in advance for any advice

Hi,

Best tyre on the front is the plan, replacing rear move the front to rear and new front..
However 37 and 25 is an odd combination and an odd one to go with. The 25 will fit the rim.

rgds, sreten.

 

[StuUngar]

Thanks for the replies. Basically I bought one of these the other day at £13.50 http://www.wiggle.co.uk/schwalbe-marathon-original-greenguard-rigid-road-city-tyre/ in a 25 without checking whether it would fit the rims.

Only did a bit of research after it turned up & wasn't sure. Anyway, had decided to get a pair of 28s and had them in my basket last night & was going to return the 25. Had a look this evening to buy & they have gone up to nearly full price - aargh!

I know that it's an odd combo but won't be for long - just need to be sure it's going to fit as have a broken arm & Marathon's pi77 me off even when I am 100%!

Will probably get one of these in a 28 for the rear http://www.chainreactioncycles.com/michelin-city-road-tyre/rp-prod26232

If it was summer I'd run the contis until they started flatting but in over 3000 miles I have only had 1 puncture & that was a pinch flat. But in this weather, wet roads, leaves & no tread they are hairy to say the least!

Cheers

 

[HLaB]

But in this weather, wet roads, leaves & no tread they are hairy to say the least!

The lack of tread means more of the tyre is in contact with the road = grippier on road.

 

[StuUngar]

The lack of tread means more of the tyre is in contact with the road = grippier on road.

Which is great on my road bikes & when I don't have to contend with rain, potholes & leaves which are littering the road. As stated, this is hybrid / tourer size wheels and I do have to contend with all these things and with a broken arm ain't much fun hence why I am fitting some tyres with tread.
I also stated that the Contis I am running are bald - they did have some tread & therefore grip - before they became bald.

Where I live there are loads of trees shedding their leaves and that is the greatest hazard with water ATM that makes it like riding on ice.

Thanks anyway

 

[HLaB]

Which is great on my road bikes & when I don't have to contend with rain, potholes & leaves which are littering the road. As stated, this is hybrid / tourer size wheels and I do have to contend with all these things and with a broken arm ain't much fun hence why I am fitting some tyres with tread.
I also stated that the Contis I am running are bald - they did have some tread & therefore grip - before they became bald.

Where I live there are loads of trees shedding their leaves and that is the greatest hazard with water ATM that makes it like riding on ice.

Thanks anyway

I have to contend with that too, not pumping your tyres too hard is more effective in improving grip, tread is just a marketing gimmick on road. The main thing is you enjoy and ride safe, good luck :-)

Particularly this morning

 

[RecordAceFromNew]

I also stated that the Contis I am running are bald - they did have some tread & therefore grip - before they became bald.

Conti Sport Contacts are bald from new - the "treads" are just cosmetic. I doubt you will find any road bike tyre that is not slippery on wet leaves, or else half the peloton would not have crashed out in the World Championship road race on Sunday...

 

[Gravity Aided]

Are people really heavy enough to make bicycle tire treads make a difference? Or are they there because they make us feel better? Or because we are used to them on our autos?

 

[andrew_s]

Tread patterns on road tyres are mostly for marketing and because people expect them. Patterns are useful off road, and mildly of benefit if there's mud or stuff on the road, but not on a clean wet road. Tarmac bites into rubber, not the other way round.
You have to be going 100mph or thereabouts for a bike tyre to aquaplane, unlike cars which have wide tyres that need grooves to clear the water even at fairly common speeds.

 

[sreten]

Hi,

FWIW I use a fatter tyre on the front with more tread at quite a bit lower pressure than the rear.
Mainly for more suspension at the front, but also more grip in dodgy conditions, the back end
going when its dodgy is much easier to deal with than the front going nearly all of the time.

Slick or near slick back for good rolling at higher pressure than the front.
Here I'd put the front on the back and put a City 35mm on the front.
I wouldn't want narrower tyres that need higher pressure in the winter.

I don't worry about having a very near slick on the back, its useful,
as long as the front has a lot more grip in dodgy conditions.

In good conditions you want a bit more from the back if you push
that hard, but I don't ever push that hard, and most do not either,
but a slicker rear tyre gives you that, wet or dry on good roads.

If I know the front end is likely to go first on good roads well
that is something simply best avoided, than investigated,
though the back will still step out under front braking.

rgds, sreten.

 

[Gravity Aided]

Sort of what I was thinking, Andrew S.

 

[StuUngar]

Appreciate the replies guys. Any of you actually fitted a 25 tyre on a rim of this size?

Bizarrely I am quite enjoying riding this bike slowly on the 37 bald Contis but not at the pressures I usually would.

Maybe I am getting old, 34, but might actually fit my Aldi rack to it & some panniers to stop me getting sweaty back!

Was amazingly averaging good speeds yesterday in awful weather as have been out of action through injury for a month. More weight & hills for winter might set me up nice for when I can actually ride the road bikes again....

 

[HLaB]

Bizarrely I am quite enjoying riding this bike slowly on the 37 bald Contis but not at the pressures I usually would.

Thats the key to improving grip running at the correct pressure many folk have them too hard

 

[StuUngar]

Thats the key to improving grip running at the correct pressure many folk have them too hard

I always run mine within the recommended tolerances - I have found it helps prevent punctures.

However haven't bothered putting any air in these & it's riding really well. The tyres look "flat" when I am sitting down. Once I get off and squeeze them they are fine!

I have a lot to learn!