Oscardw Posted September 11, 2019 Share Hello hubbers, My bike, Scott Genius 750 (2018), has the ability to switch between 27"+ and 29", and now I'm interested to do exactly that. The reason is mainly because my bike has quite a low BB, and I believe 29er will be able to just add a few needed centimeters. I just want to know if it's possible to trade my current 27"+ wheelsets for 29ers?I have the following:Rims: Syncros X-30s, 32 hole, 30mmHubs: Front - Shimano HB-M6010-B CL, 15x110mm Rear - Shimano FH-M6010 CL, 12x148mmTires: Maxxis Recon 2.8"I also have a Shimano CS-HG50-10 speed cassette, which I believe is not compatible with Sram XD hubs, but in the future I'd probably want to upgrade to Sram SX/NX and I don't know if XD hubs and Shimano cassetes are compatible for the time being?What can I expect to get for my wheelset aswell? Thanks in advance! Link to comment Share on other sites More sharing options...
Schnavel Posted September 11, 2019 Share I can't provide much insight on the wheels, but if you are planning on going with Sram NX in future, you will be able to use a standard freebody as the NX (50-11) doesn't require the XD driver - this is only needed if you want to go for GX or higher in the range. Have a look in the classifieds, lots of good deals on 29er wheels. I suspect you may struggle to sell the 27+ wheels as I don't believe there is a big market for them. Link to comment Share on other sites More sharing options...
porqui Posted September 11, 2019 Share Hello hubbers, The reason is mainly because my bike has quite a low BB, and I believe 29er will be able to just add a few needed centimeters. You will gain max 18mm but your CG will also be 18mm higher Link to comment Share on other sites More sharing options...
Stretched@Birth Posted September 11, 2019 Share You gain no height advantage between your 27.5+ and the 29er wheels, as shown by the below graphic. Link to comment Share on other sites More sharing options...
Jehosefat Posted September 11, 2019 Share You gain no height advantage between your 27.5+ and the 29er wheels, as shown by the below graphic. That is specifically assuming 3.0" tyres on the 27.5+ and 2.3" tyres on the 29er. If you go from 2.8" 27.5+ to 2.4" 29er you will gain some BB clearance. That said, you're not going to gain all that much I wouldn't think. Link to comment Share on other sites More sharing options...
dasilvarsa Posted September 11, 2019 Share Another Option is to sell the bike you have and to buy a 29er with full Eagle. Link to comment Share on other sites More sharing options...
Orbit Posted September 11, 2019 Share I may have a set of 29" crests. A straight swop with your wheelset is a possible option. Link to comment Share on other sites More sharing options...
keithbe Posted September 11, 2019 Share You definitely do gain mm's. Went from 27.5 x 3.0 to 29 x 2.6 and there is a noticeable difference with far less pedal strikes on the 9ers. You gain no height advantage between your 27.5+ and the 29er wheels, as shown by the below graphic. Link to comment Share on other sites More sharing options...
Grease_Monkey Posted September 11, 2019 Share You gain no height advantage between your 27.5+ and the 29er wheels, as shown by the below graphic.Quite a big difference as shown here. My 29" setup at the back, 27.5+ in the front. Link to comment Share on other sites More sharing options...
MORNE Posted September 12, 2019 Share cant comment on 27+ but my latest frame accommodates 27x3.25 or 29x2.6 out of the box. i built it 29x2.6 also..see below. Useful stuff even when you want to determine if a wheel will fit in your frame. https://www.bikecalc.com/wheel_size_math as per the images...you'll see that even a 3.0 650b wheel and tire will comein shorter than a 29x2.6 (754mm vs 736mm) Link to comment Share on other sites More sharing options...
Stretched@Birth Posted September 12, 2019 Share Quite a big difference as shown here. Screenshot_20190911-225023_Gallery.jpg My 29" setup at the back, 27.5+ in the front.The 29er wheel looks oval...? I'm sure that there is some difference, depending on a few of factors, including tyre size (2.8 vs 3.0 vs 2.2 vs 2.4), pressure (this will probably have quite a big impact), rim width, etc. Just locking out the rear on my bike reduces pedal strike quite a bit. At the OP, I may have a buyer for your wheels if you do decide to make the change. Link to comment Share on other sites More sharing options...
Grease_Monkey Posted September 12, 2019 Share The 29er wheel looks oval...? I'm sure that there is some difference, depending on a few of factors, including tyre size (2.8 vs 3.0 vs 2.2 vs 2.4), pressure (this will probably have quite a big impact), rim width, etc. Just locking out the rear on my bike reduces pedal strike quite a bit. At the OP, I may have a buyer for your wheels if you do decide to make the change.It's definitely not oval. Point is the marketing behind 27.5+ being the same size as 29" is a load of bull. The only time it's the same is with a 29"x2.1" tyre compared to a 27.5"x3.0" tyre - both sizes people don't really use. When you compare a 2.4" 29er tyre found on most trail bikes to a 2.8" 27.5 tyre found on most plus bikes the difference in size (and bb heigt) becomes quite significant. Just from my experience, if I put the plus wheels on my dual suspension trail bike I have a ton of pedal strikes, 29" wheels - next to nothing. I would say 29" wheels with grippy tyres are better on a dual suspension bike, and 27.5+ tyres are great on a hardtail. Just my 2c from trying out waaay too many wheel/tyre combos. Link to comment Share on other sites More sharing options...
Eugene Posted September 12, 2019 Share Quite a big difference as shown here. Screenshot_20190911-225023_Gallery.jpg My 29" setup at the back, 27.5+ in the front.Both wheels are on the ground. Wheels are mounted through the hub or the center point of the wheel. The net increase of ground clearance is therefore half of what is shown in the pic Link to comment Share on other sites More sharing options...
Grease_Monkey Posted September 12, 2019 Share Both wheels are on the ground. Wheels are mounted through the hub or the center point of the wheel. The net increase of ground clearance is therefore half of what is shown in the picBoth on the ground, so yes, BB height increases by about 10mm - which is quite significant when it comes to pedal strikes. Link to comment Share on other sites More sharing options...
keithbe Posted September 12, 2019 Share Although each wheel is on the ground the overall difference still counts. If the wheels were centred the 27.5 would be smaller by the difference when grounded and compared to the 9er. Link to comment Share on other sites More sharing options...
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