- 26" wheels in a 650b frame…instant *death?
Imagine a Hummer with Ford Focus wheels on, it’ll be like that.
No really, i’ve not tried but i’m sure it’ll be fine, not optimised but fine.
I actually think in the not-too-distant-future that frames will be manufactured so that the geo can be optimised for either 26″ or 27.5″ using offset bearing-chips or whatever…Could be wrong.Posted 4 years agobennyboy1Member
How would for example a SC Bronson Carbon 650b / 27.5 frame feel and ride if it happened to have 26″ wheels / 150mm 26″ forks fitted to it? Would the small wheels ruin the murdered out handling, would the lowered BB mean a certain crash and burn *death for the sucked in marketing man’s dream…
Anyone been cheapskate enough to have bought a 650b frame but not enough cash to ‘upgrade’ their 26″ wheels / forks to 650b and *dared ride it?
*whilst this post is liberally dosed with sarcasm I am genuinely interested to discover if anyone has attempted this and found satisfactory results.Posted 4 years agoStrangaMember
I had an enduro race recently on really steep muddy trails so fitted some old 26″ wheels with 2.5 wetscreams to my 650b frame n forks, bike rode fine and even had added mud clearence…..ended up with 2nd in category and 9th overall…….did about 20 miles on them that day with no issues at all.Posted 4 years agonukeSubscriber
Thinking of this myself…good way to allow me to ‘future proof’ my bike. Aside the drop in the BB height can’t really see too many problems.
I was wondering also, even if I got some new 650b wheels and forks for the new 650b frame, whether to keep my my 26″ AM/DH forks and wheels and fit them to the 650b frame for trips abroad where you know wheels will get dinged and forks scuffed up.Posted 4 years agoGEDAMember
So how much difference is there between a 26 and a 27.5 frame? I just got a Nukeproof mega and CRC has a table with the geo of both frames and there does not seem to be much difference. Would it be possible to machine different dropouts so you get about the same geo?
Frame Sizes 43cm (17″)
TT Effective 590
Head Angle 66
Head Tube 115
Seat Tube Angle 72
BB Height +9.6
Frame Sizes 43cm (17″)
TT Effective 596
Head Angle 66
Head Tube 110
Seat Tube Angle 73
BB Height -3
If you machined some dropouts where the axle was a bit higher up and pushed a bit further back how much difference is there going to be? The BB height is also going to be affected by how much sag you run.
Not that I really really want 27.5 wheels as I already have a big wheeled Titus Fireline and although it is a lovely bike and great for trail duties it is not as fun/manoeuvrable on drops/jumps and really steep stuff which I what I bought the Nukeproof for.Posted 4 years agocampfreddieMember
i was thinking about this earlier, because i really fancy this:-
i have a exotic 29er fork already but 26″ wheels.
what do you reckon?Posted 4 years agochiefgrooveguruMember
The BB drop is the critical thing. The Banshee Spitfire is very low slung, 4mm BB drop unsagged, adjustable +/-6mm via the dropouts, so with the droputs in the neutral position and 26″ wheels it’s 336mm (13.25″) BB height and with 650B wheels it’s 346mm (13.65″) BB height.
I wouldn’t go putting 650B wheels on a 26″ bike unless it’s very low as a 26″ because half the benefit of the bigger wheel is increased BB drop without a BB height so low you’re always pedal striking. If you just take a balanced and normal BB height 26″ bike and give it 650B wheels it’s like putting a footballer in platform soles and thinking it’ll make him better at everything, not just reaching headers.
With a full-sus you could just run more sag with the 650B wheels to get the BB down to a good height but how well that work depends on the suspension characteristics – quite a lot of modern bikes are designed to work around a certain sag for good pedalling and pumping without needing tons of low speed compression damping on the shock.Posted 4 years agotwohatsMember
A Bronson with 26″ wheels!
Doesn’t look like a death machine to me!
I’ve realised that my next frame will have to be a 650b frame and I don’t really want to shell out for new wheels and forks and pondered the OP’s question, which led to this bit of research on B/B heights.
Nomad with 26″ wheels and 160mm Pikes = 355mm B/B (my current bike)Posted 4 years ago
Bronson with 650b wheels and 150mm 650b Pike (same length as 26″ 160 Pike) = 346mm B/B
Bronson with 26″ wheels, 160mm 26″ Pike = 336mm B/B, which puts the B/B height at the same height as a Santa Cruz 5010 and 6mm higher than a Nukeproof TR275!
The angles would remain the same, but with a nice low B/B height.
I reckon it’d be a right laugh to ride!chiefgrooveguruMember
Surely it would be about the same as running a 2.1 tyre on a 26er.
i.e you’ll lose about 10mm bottom bracket height.
Bet you don’t notice.
I notice how much lower my Soul sits with its winter tyres (Baron 2.3 & XR-Mud 2.0) than with its summer tyres (Rubber Queen 2.2).Posted 4 years agocookeaaSubscriber
People seem to think the difference is about this much:
When in reality it’s actually about this much:
It’ll be fine. as many people have already said the like for like difference is pretty much bang on 12mm radially 559 Vs 584mm for the Rims…
but going for a bigger 26″ tyre will reduce the difference: A 650b wheel using a 2.2″ tyre comes out about 695mm OD (~27.4″) a 26″ using a 2.5″ tyre would out 686mm OD (~27″)Posted 4 years ago
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