Rim width , tire width chart
- Thread starter SideFX
- Start date
Willy Pete
Squid
Try this one below, can't remember now where I found it, but filed it away on my PC for reference.
(All dimensions millimetres)
It seems to work out okay for the various tyre & rim combos I've had on my 29er.
(All dimensions millimetres)
It seems to work out okay for the various tyre & rim combos I've had on my 29er.
SideFX
Likes Bikes and Dirt
Looking for info or opinions on the newer Id sizing 30/35 mm . If people have any opinions or valid points please share .
pharmaboy
Eats Squid
Ok, best summary I can give you from this topic on mtbr is there are 2 tyre designers on mtbr, one for specialized and one ex maxxis designer, and both say their designs are for commonly used rims at the time of design - so that generally is around 24, 25mm for a downhill tyre and 21mm for xc, am etc. One of those designers ( the ex maxxis guy) says advantages to wider IDs stops at around 27mm ( is that the wide lightening width perhaps?). This obviously disagrees with ibis and derby who are trail blazing wider is better.
Point 2 - how the tyre changes shape when you look at it bears no relationship to how it acts on the contact patch.
Wider rims do seem to hold the tyre better and lessen the incidence of burping, so you can run a lower pressure than previous. HOWEVER, this now increases the chance of rim strike, which for alloy rims is not such a big issue, but tends to crack a lot of the carbon ones. So if you need higher pressure because of burping on corners but never rim strike, they are an advantage.
That's my summary of the situation anyway
SideFX
Likes Bikes and Dirt
A friend has the 40 mm /35 mm ID rim running a2.4 Minion DHR2 , what i did notice was how much more side wall was exposed . Im tossing up between rims , fat carbons or alloys around the 27 id mark . So Im trying to work out pro`s and cons . While were having a chat , what do you think about rims . carbon v alloy etc .
pharmaboy
Eats Squid
Carbon versus alloy - lighter versus heavier, more choice in widths and whether it has a bead or not . A few people are reporting cracked carbon rims in the more gravity side of things , and that's because they crack if hit hard not bend like alloy does. I think that people are running too low a pressure on the wide rims because they can get away with it without burping and this is causing the cracked rims.
Main advantage of carbon seems to be how straight they stay, really just don't go out of true as easy and I've seen one with a broken spoke that still rolls straight. Personally I haven't bought into the beadless thing.z
Main advantage of carbon seems to be how straight they stay, really just don't go out of true as easy and I've seen one with a broken spoke that still rolls straight. Personally I haven't bought into the beadless thing.z
Yarrahappinni
Likes Dirt
I've ordered some 35/29mm rims in alloy 650b.
Why did I choose this?
1. Preferred riding is gravity trails (Trance SX).
2. Didn't think the carbon advantage was needed
3. Don't have any carbon repairers next door
4. I like to run 2.3 to 2.5 gravity tyres
5. $120 ea rim (alloy) to $400(?) in carbon
6. Like the theory of the wider rim so I put my money where my mouth is.
7. If they don't work I will put my original 21mm alloy rims back on.
Give you a report maybe next week when they are fitted.
Why did I choose this?
1. Preferred riding is gravity trails (Trance SX).
2. Didn't think the carbon advantage was needed
3. Don't have any carbon repairers next door
4. I like to run 2.3 to 2.5 gravity tyres
5. $120 ea rim (alloy) to $400(?) in carbon
6. Like the theory of the wider rim so I put my money where my mouth is.
7. If they don't work I will put my original 21mm alloy rims back on.
Give you a report maybe next week when they are fitted.