You don't need to be an 'investor' to invest in Singletrack: 6 days left: 95% of target - Find out more
hi STW, apologies if this is an obvious newb question, but what would be the narrowest tyres I could run on 27.5 40mm Tubeless Ready Rims, rims that were designed for "plus" tyres and currently come fitted with 3.0" tyres.
Asking as the rolling resistance on 3.0" tyres for my daughter could become a pain for me when we're out just bimbling around, so wondering if I will be able to fit 2.4-2.6 tyres with no dramas ?
Need to check this before a potential 2ndhnd purchase.
40mm internal or external? you'll be fine with 2.4/2.6 especially if it's just for bimbling, they'll be a little square but that won't be an issue.
Strictly bimbling you'd get away with more... I can't see a 2.6 being an issue but Maxxis 2.4 might be pushing it. Obviously depends on the rim/tyre combo...
I’ve run Maxxis Shorty 2.5 WT on a Velocity Dually 29er rim before, think internal width on them is 39 or 40mm. Was fine but much prefer a 2.6 or 2.8.
3" tries at 20psi should have broadly the same rolling resistance as 2.4" tyres at 20psi so just pump them up a little more
At a slight tangent, but I've noticed that gravel rims are getting 25mm internal but they're still using less than 50mm tyres. But at the same time, some people say you can't use a 2.25" tyre on a 30mm internal rim.
Does make you wonder.
Successfully running Maxxis 2.4" and 2.5" tyres on 40mm rims that previously had 2.8"/3.0" tyres on. No issues to report.
I briefly had a Bontrager 2.6 on an 40mm id rim and it was fine. Sidewalls were a little square, but not overly so.
The tyre is still on the rim, but someone else owns the bike now and they're getting on fine with it.
I'm going 2.8 on a 45mm internal if that's any help?
Not built the wheel, fitted the tyre or ridden it, so probably not much help! I reckon it's going to be fine though.
I think the rough rule of thumb is rim width x 1.5 gives min tyre width
Which agrees with the above
I'm running 2.35 in a 45mm dually 29er rim, sidewall sticks out a little bit the tread is still rounded not flat
On the front here
thanks guys, the exact rims are these:
DT CSW B+ 3.7 Straightpull Wheelset, 28/28 Spokes, Boost 110x15mm / Boost148 X12, 40mm Tubeless Ready Rim, DT Swiss Pro Head® Reinforcement System, Squorx® Alloy Nipples
I'm not sure if the 40mm refers to external or internal
read all the replies - sounds like I can go ahead and buy the bike.
Thanks all
@rocketdog looks like a nice tyre / rim size combo
In other news how are you finding the loop ‘n’ drop bar and which one is it?
I’m running a 440mm Farr and I should have gone 460mm. Plus I’d have liked the loop to go an inch or so further forward for more stretch.
@igm it's a redshift kitchen sink bar at 44cm which is the narrowest they do. review will be up on ukgravelco.com in the next few days. There's a few things I'd change but it's great on the not really designed for drops singular
@walowiz - this bike per chance?
If so, they're DT swiss XM551 rims which are indeed 40mm internal. Good rims.
@walowiz – this bike per chance?
https://www.cube.eu/en/2016/e-bike-fullsuspension/stereo-hybrid/cube-stereo-hybrid-140-hpa-500-275-petrolnflashorange-2016/
If so, they’re DT swiss XM551 rims which are indeed 40mm internal. Good rims.
It is a cube, but not that one. It’s a stereo 150 HPA race.
Cool - chances are they're the same rim anyway, DT don't make many 40mm rims.
I'm running 2.6 on 38mm rims with no issues and I've pushed it pretty hard. I wouldn't advise going narrower than 2.6 though.
I run Ardent 2.4 and Halo Vapour 45mm internal combo on my Rooster SS with no issues.
Some people above mentioned Maxxis tyres with the WT suffix, I feel there is an important point being missed here.
Maxxis developed these tyres for Wide Trail ie 35-40mm rims, and people like hunt, sun ringle, stans etc all produce enduro rims for WT tyres. Typically 2.3-2.5 width.
Thus your 40mm rims will probably be fine with a set of WT tyres.
They will probs be fine with any old tyres but those ones are at least designed for wider rims, without needing 3.0 width.
https://www.maxxis.com/wide-trail-wt-design
https://www.huntbikewheels.com/products/hunt-endurowide-mtb-wheelset?
https://hayesbicycle.com/collections/sunringle/products/duroc-sd42-rim
If you ride in sharp rocky areas, wide(r) rims for the tyre width expose the sidewalls more to cuts, so it is said. Which is logical.
Actually Maxxis WT are for 30mm Id rims upwards