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MTBgeometryguru jamessmurthwaite's article
Aug 15, 2019 at 19:03
Aug 15, 2019
Randoms: Special Edition Stem, Throwback Bikes & More - Crankworx Whistler 2019
You're right. It looks like it has curry Diarrhea and a bleeding arse!
MTBgeometryguru mikekazimer's article
Aug 14, 2019 at 13:51
Aug 14, 2019
First Ride: 2020 Rocky Mountain Slayer
@telephunke: Not sure. It depends on a lot of things. I think the shift to 29ers is more to do with the fact that the Geo is better for most people. Generally speaking they have a taller stack height and longer chains stays. This doesn't suit everyone though so it depends on your own personal measurements. For me I don't suit many 29ers because my arms are really long compared to my height so I need the lower stack height of the 27.5 or really long chainstays on a 29er. I can give you an idea if you tell me your arm span (finger tip to finger tip) and your height. The measurements I use are a bit more detailed than that but I could at least compare your current bike to a new slayer. Also what is your current bike?
MTBgeometryguru mikekazimer's article
Aug 13, 2019 at 15:35
Aug 13, 2019
First Ride: 2020 Rocky Mountain Slayer
It's because of the high stack height compared to reach. I ran through my dimensions on the 29 and the 27.5 slayers. The 27.5 would have 18mm more effective reach for me than the 29er due to the lower stack height. That would make the 275 feel like a lot bigger bike even though the reach numbers are the same. Also the 29er rear centre is longer compered to wheelbase so suits a more upright riding position while keeping the weight split right. To have the same weight split on the 275 I would need to be 15mm further forward. It doesn't sound like much but we're talking a 65mm stem V 50mm stem. This gives you a totally different feeling when riding. It will be interesting to see the reviews when they come out.
MTBgeometryguru mikekazimer's article
Aug 13, 2019 at 15:03
Aug 13, 2019
First Ride: The 2020 Specialized Enduro is Bigger & Burlier Than Ever
Yeah it does look good but I'm not too sure about the shortish seatpost lengths combined with a slack actual seat tube angle. You can see from Mike's comment that he had to move the seat forward all the way. I think he might have a similar issue if he went with the smaller frame size too. With the top 2 sizes you will still need to get your weight forward to weight the front tyre as the long front centre is very long. It is good to see some longer chainstays though but still not long enough on the top two sizes in my opinion.
MTBgeometryguru jamessmurthwaite's article
Aug 7, 2019 at 18:33
Aug 7, 2019
Norco Factory Team Mechanic Lewis Kirkwood Thinks Mountain Biking Could be Giving us Bad Vibrations
@davec113: I just put a -20 degree 50mm stem on my Daughters Devinci to try and get her weight further forward. High stack height on them. You are definitely limited with raising bars on bikes with long front centres as you'll run in to front wheel traction issues. Pole bikes - yeah I think they will suit someone with shorter arms. I can't get the numbers to work for me. Same story with geometron. I have studied some photo's of Chris Porter and it looks like he has shorter arms compared to his height and torso. My elbow is below my hip bone. His look like they are 2/3rds of the way between his armpit and hip. So his bikes probably work really well for him but won't be everyones cup of tea.
MTBgeometryguru jamessmurthwaite's article
Aug 7, 2019 at 16:29
Aug 7, 2019
Norco Factory Team Mechanic Lewis Kirkwood Thinks Mountain Biking Could be Giving us Bad Vibrations
@davec113: Yeah 10mm makes a big difference. Problem is the latest 2020 bikes are getting really long in the front end meaning you need to get your weight forward more to weight the front wheel. It won't be so bad on smaller bikes but taller guys will notice it. Just read a review on the latest Reign where tester noted lack of weight on the front wheel was an issue on anything other than really steep stuff.
MTBgeometryguru jamessmurthwaite's article
Aug 7, 2019 at 15:18
Aug 7, 2019
Norco Factory Team Mechanic Lewis Kirkwood Thinks Mountain Biking Could be Giving us Bad Vibrations
@zede: I used to have a real problem with losing feeling in my hands. It would start with pins and needles and riding up I would have to shake my hands. I worked out a formula to set up my bike properly and ended up raising my bars 30mm. No more hand problems. Same grips, brakes etc. Also had problems with my bits- you know- down there, on long climbs. This is fixed now too. If your bike has a low stack height, your bars are probably too low putting too much weight on your hands. Had a mate having the same issues and he has fixed it too.
MTBgeometryguru mikekazimer's article
Aug 7, 2019 at 14:44
Aug 7, 2019
First Ride: 2020 Giant Reign Advanced 29
@BenPea: I think it would be fair to say you lost me there actually!
MTBgeometryguru mikekazimer's article
Aug 7, 2019 at 14:34
Aug 7, 2019
First Ride: 2020 Giant Reign Advanced 29
@NotNamed: What is your arm span though? Mine is 190cm. Depends what you ride too. It's not as simple as just working on a reach number. Stack is just as important as is your arm length. Reach on its own means nothing. The lower the stack height the longer the bike will feel. If you have been riding Trek, Giant Spec etc they have traditionally been very low in the front end. Look at Evil, Devinci etc and they are very high stack heights and they will feel a lot shorter for the same reach number. I know this as two of my kids have devinci's and the Large 29er Spartan is way too small for me.
MTBgeometryguru mikekazimer's article
Aug 7, 2019 at 14:25
Aug 7, 2019
First Ride: 2020 Giant Reign Advanced 29
@tobiusmaximum: I'm old and I've ridden a lot of bikes. Perfect for me is 635 stack and 505 reach depending on chainstay/ wheelbase to get the weight split right. Yes I can ride the medium but it is the same as what I've got now and my bike is too small. If I had shorter arms the M would be great. Most bikes seem to be optimised for my height with normal arm span as this is the average height of most of the potential bike buyers.Tall guys have got it tough and guys with long arms or really short arms.
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