37mm-40mm gravel tyres, best inner rim width? 20mm, 22mm, 24mm?

Especially for light weight issues concerning cyclocross / touring bikes & parts.

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frogtape777
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Joined: Thu Dec 20, 2018 9:35 pm

by frogtape777

24mm doesn't seem officially supported by many of the tyres EG WTB Nano 40mm reccomends 23mm max inner. There seem a big craze to go wider, but is the extra weight worth is over 20mm or 22mm, which support 37-40mm much better in all the literature?

ER1600 20mm internal https://www.dtswiss.com/en/products/whe ... -spline-23
CR1600 22mm internal https://www.dtswiss.com/en/products/whe ... -dicut-25/
GR1600 24mm internal https://www.dtswiss.com/en/products/whe ... spline-25/

jfranci3
Posts: 682
Joined: Tue Jul 26, 2016 5:21 pm

by jfranci3

Running 42mm GK SK on 20mm Int, no problems.

90grams for 4mm wider? It’s a non decision here. GR all the way.

by Weenie


frogtape777
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by frogtape777

jfranci3 wrote:
Tue Jul 02, 2019 11:30 pm
Running 42mm GK SK on 20mm Int, no problems.

90grams for 4mm wider? It’s a non decision here. GR all the way.

Thanks, so you'd go 24mm given the weight penalty, as GK SK on 20mm is making me think ER or CR way to go :lol: 8)

jfranci3
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by jfranci3

I don’t see a case for the ER unless you want a cheap road climbing wheel or it was on sale. Not seeing why you’d go CR unless you’re putting road tires on it or it was on sale.

Are you going to run tubes?

jeanjacques
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Location: France

by jeanjacques

Myth 18: Wide Tires Need Wide Rims:
https://janheine.wordpress.com/2019/06/ ... wide-rims/

Nefarious86
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by Nefarious86

While they don't need them they certainly ride much better with them.

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frogtape777
Posts: 118
Joined: Thu Dec 20, 2018 9:35 pm

by frogtape777

jfranci3 wrote:
Wed Jul 03, 2019 12:27 am
I don’t see a case for the ER unless you want a cheap road climbing wheel or it was on sale. Not seeing why you’d go CR unless you’re putting road tires on it or it was on sale.

Are you going to run tubes?
I have the PR1600 already for my GP5000 road tyres with an 18mm inner and they match perfectly.

CR would be 2mm wider than your current 20mm/42mm setup so seem a good choice, as i'd only be running 40mm max?

GR i'm still trying to figure if the extra weight is going to benefit the width.

frogtape777
Posts: 118
Joined: Thu Dec 20, 2018 9:35 pm

by frogtape777

jeanjacques wrote:
Wed Jul 03, 2019 6:57 am
Myth 18: Wide Tires Need Wide Rims:
https://janheine.wordpress.com/2019/06/ ... wide-rims/
Thanks will have a read!

Marin
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Joined: Wed Jan 22, 2014 11:48 am
Location: Vienna Austria

by Marin

I'm running 35, 42 and 48mm on 19c, no issues even at quite low pressures (sub 2 bars for the widest option).

NickJHP
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Location: Canberra, Australia

by NickJHP

Marin wrote:
Wed Jul 03, 2019 9:08 am
I'm running 35, 42 and 48mm on 19c, no issues even at quite low pressures (sub 2 bars for the widest option).
I think there's too much nonsense talked either way. My touring bike has for many years been running 700x37 or 700x38 tyres on Mavic MA2 rims, which are 13mm internal width, and, going completely in the other direction, I also have G-One 700x30 on DT Swiss XM401 rims, which are 22.5mm internal. I can't detect any problem with either setup.

TheRich
Posts: 386
Joined: Tue Jan 01, 2019 1:36 am

by TheRich

jeanjacques wrote:
Wed Jul 03, 2019 6:57 am
Myth 18: Wide Tires Need Wide Rims:
https://janheine.wordpress.com/2019/06/ ... wide-rims/
“I don’t think rim width matters. We used to race mountain bikes on narrow Mavic MA-2 road racing rims. I actually preferred how the bike handled with the narrow rims.”

Yeah, that's a trash opinion.

Although gravel sized tires lack the grip to really stress the tire to the point that MTBs do, wider rims increase volume which adds comfort/durability.

Marin
Posts: 3502
Joined: Wed Jan 22, 2014 11:48 am
Location: Vienna Austria

by Marin

TheRich wrote:
Wed Jul 03, 2019 10:09 pm
Yeah, that's a trash opinion.

Although gravel sized tires lack the grip to really stress the tire to the point that MTBs do, wider rims increase volume which adds comfort/durability.
Wider tires also do that

TheRich
Posts: 386
Joined: Tue Jan 01, 2019 1:36 am

by TheRich

Marin wrote:
Thu Jul 04, 2019 10:49 am
TheRich wrote:
Wed Jul 03, 2019 10:09 pm
Yeah, that's a trash opinion.

Although gravel sized tires lack the grip to really stress the tire to the point that MTBs do, wider rims increase volume which adds comfort/durability.
Wider tires also do that
The width of the tire is the constant here, because a wider rim increases the volume of all tires.

Mr.Gib
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by Mr.Gib

jeanjacques wrote:
Wed Jul 03, 2019 6:57 am
Myth 18: Wide Tires Need Wide Rims:
https://janheine.wordpress.com/2019/06/ ... wide-rims/
I am afraid this is nonsense. In the first place it is completely unsupported by any useful data. The whole idea that a wider rim results in more vertical sidewalls that are prone to callapse is just silly. Air pressure causes tires to take a uniform circular/round shape (uniform radius). A wider rim just means a slightly bigger circle. Deviations from a perfect circle are the result of varying tread thickness. More anectdotally, it is not possible to accept the idea that a tire with a narrower base of support will be more stable than the same tire with a wider base of support. Consequently the whole tubular and sidewall stiffness parts of Heine's argument are mostly irrelevant to the issue of the evaluating the impact of clincher rim width in terms of narrow vs wide. Jan Heine has made many good contributions to the bike world but occasionally he gets quite lost.
Afterall, were talking about the same guy who wrote this:

Myth 12: Disc Brakes Work Better Than Rim Brakes
"https://janheine.wordpress.com/2018/07/ ... im-brakes/
Last edited by Mr.Gib on Thu Jul 04, 2019 8:21 pm, edited 1 time in total.
wheelsONfire wrote: When we ride disc brakes the whole deal of braking is just like a leaving a fart. It happens and then it's over. Nothing planned and nothing to get nervous for.

TheRich
Posts: 386
Joined: Tue Jan 01, 2019 1:36 am

by TheRich

A virtual cornucopia of bullshit from that guy.

https://janheine.wordpress.com/2018/08/ ... rsteering/

by Weenie


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